1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <net/dst_metadata.h> 22 #include <linux/phy.h> 23 #include <linux/byteorder/generic.h> 24 #include <linux/if_arp.h> 25 26 #include <uapi/linux/if_macsec.h> 27 28 /* SecTAG length = macsec_eth_header without the optional SCI */ 29 #define MACSEC_TAG_LEN 6 30 31 struct macsec_eth_header { 32 struct ethhdr eth; 33 /* SecTAG */ 34 u8 tci_an; 35 #if defined(__LITTLE_ENDIAN_BITFIELD) 36 u8 short_length:6, 37 unused:2; 38 #elif defined(__BIG_ENDIAN_BITFIELD) 39 u8 unused:2, 40 short_length:6; 41 #else 42 #error "Please fix <asm/byteorder.h>" 43 #endif 44 __be32 packet_number; 45 u8 secure_channel_id[8]; /* optional */ 46 } __packed; 47 48 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 49 #define MIN_NON_SHORT_LEN 48 50 51 #define GCM_AES_IV_LEN 12 52 53 #define for_each_rxsc(secy, sc) \ 54 for (sc = rcu_dereference_bh(secy->rx_sc); \ 55 sc; \ 56 sc = rcu_dereference_bh(sc->next)) 57 #define for_each_rxsc_rtnl(secy, sc) \ 58 for (sc = rtnl_dereference(secy->rx_sc); \ 59 sc; \ 60 sc = rtnl_dereference(sc->next)) 61 62 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 63 64 struct gcm_iv_xpn { 65 union { 66 u8 short_secure_channel_id[4]; 67 ssci_t ssci; 68 }; 69 __be64 pn; 70 } __packed; 71 72 struct gcm_iv { 73 union { 74 u8 secure_channel_id[8]; 75 sci_t sci; 76 }; 77 __be32 pn; 78 }; 79 80 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 81 82 struct pcpu_secy_stats { 83 struct macsec_dev_stats stats; 84 struct u64_stats_sync syncp; 85 }; 86 87 /** 88 * struct macsec_dev - private data 89 * @secy: SecY config 90 * @real_dev: pointer to underlying netdevice 91 * @dev_tracker: refcount tracker for @real_dev reference 92 * @stats: MACsec device stats 93 * @secys: linked list of SecY's on the underlying device 94 * @gro_cells: pointer to the Generic Receive Offload cell 95 * @offload: status of offloading on the MACsec device 96 */ 97 struct macsec_dev { 98 struct macsec_secy secy; 99 struct net_device *real_dev; 100 netdevice_tracker dev_tracker; 101 struct pcpu_secy_stats __percpu *stats; 102 struct list_head secys; 103 struct gro_cells gro_cells; 104 enum macsec_offload offload; 105 }; 106 107 /** 108 * struct macsec_rxh_data - rx_handler private argument 109 * @secys: linked list of SecY's on this underlying device 110 */ 111 struct macsec_rxh_data { 112 struct list_head secys; 113 }; 114 115 static struct macsec_dev *macsec_priv(const struct net_device *dev) 116 { 117 return (struct macsec_dev *)netdev_priv(dev); 118 } 119 120 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 121 { 122 return rcu_dereference_bh(dev->rx_handler_data); 123 } 124 125 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 126 { 127 return rtnl_dereference(dev->rx_handler_data); 128 } 129 130 struct macsec_cb { 131 struct aead_request *req; 132 union { 133 struct macsec_tx_sa *tx_sa; 134 struct macsec_rx_sa *rx_sa; 135 }; 136 u8 assoc_num; 137 bool valid; 138 bool has_sci; 139 }; 140 141 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 142 { 143 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 144 145 if (!sa || !sa->active) 146 return NULL; 147 148 if (!refcount_inc_not_zero(&sa->refcnt)) 149 return NULL; 150 151 return sa; 152 } 153 154 static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc) 155 { 156 struct macsec_rx_sa *sa = NULL; 157 int an; 158 159 for (an = 0; an < MACSEC_NUM_AN; an++) { 160 sa = macsec_rxsa_get(rx_sc->sa[an]); 161 if (sa) 162 break; 163 } 164 return sa; 165 } 166 167 static void free_rx_sc_rcu(struct rcu_head *head) 168 { 169 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 170 171 free_percpu(rx_sc->stats); 172 kfree(rx_sc); 173 } 174 175 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 176 { 177 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 178 } 179 180 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 181 { 182 if (refcount_dec_and_test(&sc->refcnt)) 183 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 184 } 185 186 static void free_rxsa(struct rcu_head *head) 187 { 188 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 189 190 crypto_free_aead(sa->key.tfm); 191 free_percpu(sa->stats); 192 kfree(sa); 193 } 194 195 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 196 { 197 if (refcount_dec_and_test(&sa->refcnt)) 198 call_rcu(&sa->rcu, free_rxsa); 199 } 200 201 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 202 { 203 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 204 205 if (!sa || !sa->active) 206 return NULL; 207 208 if (!refcount_inc_not_zero(&sa->refcnt)) 209 return NULL; 210 211 return sa; 212 } 213 214 static void free_txsa(struct rcu_head *head) 215 { 216 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 217 218 crypto_free_aead(sa->key.tfm); 219 free_percpu(sa->stats); 220 kfree(sa); 221 } 222 223 static void macsec_txsa_put(struct macsec_tx_sa *sa) 224 { 225 if (refcount_dec_and_test(&sa->refcnt)) 226 call_rcu(&sa->rcu, free_txsa); 227 } 228 229 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 230 { 231 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 232 return (struct macsec_cb *)skb->cb; 233 } 234 235 #define MACSEC_PORT_SCB (0x0000) 236 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 237 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 238 239 #define MACSEC_GCM_AES_128_SAK_LEN 16 240 #define MACSEC_GCM_AES_256_SAK_LEN 32 241 242 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 243 #define DEFAULT_XPN false 244 #define DEFAULT_SEND_SCI true 245 #define DEFAULT_ENCRYPT false 246 #define DEFAULT_ENCODING_SA 0 247 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 248 249 static sci_t make_sci(const u8 *addr, __be16 port) 250 { 251 sci_t sci; 252 253 memcpy(&sci, addr, ETH_ALEN); 254 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 255 256 return sci; 257 } 258 259 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 260 { 261 sci_t sci; 262 263 if (sci_present) 264 memcpy(&sci, hdr->secure_channel_id, 265 sizeof(hdr->secure_channel_id)); 266 else 267 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 268 269 return sci; 270 } 271 272 static unsigned int macsec_sectag_len(bool sci_present) 273 { 274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 275 } 276 277 static unsigned int macsec_hdr_len(bool sci_present) 278 { 279 return macsec_sectag_len(sci_present) + ETH_HLEN; 280 } 281 282 static unsigned int macsec_extra_len(bool sci_present) 283 { 284 return macsec_sectag_len(sci_present) + sizeof(__be16); 285 } 286 287 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 288 static void macsec_fill_sectag(struct macsec_eth_header *h, 289 const struct macsec_secy *secy, u32 pn, 290 bool sci_present) 291 { 292 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 293 294 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 295 h->eth.h_proto = htons(ETH_P_MACSEC); 296 297 if (sci_present) { 298 h->tci_an |= MACSEC_TCI_SC; 299 memcpy(&h->secure_channel_id, &secy->sci, 300 sizeof(h->secure_channel_id)); 301 } else { 302 if (tx_sc->end_station) 303 h->tci_an |= MACSEC_TCI_ES; 304 if (tx_sc->scb) 305 h->tci_an |= MACSEC_TCI_SCB; 306 } 307 308 h->packet_number = htonl(pn); 309 310 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 311 if (tx_sc->encrypt) 312 h->tci_an |= MACSEC_TCI_CONFID; 313 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 314 h->tci_an |= MACSEC_TCI_C; 315 316 h->tci_an |= tx_sc->encoding_sa; 317 } 318 319 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 320 { 321 if (data_len < MIN_NON_SHORT_LEN) 322 h->short_length = data_len; 323 } 324 325 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 326 static bool macsec_is_offloaded(struct macsec_dev *macsec) 327 { 328 if (macsec->offload == MACSEC_OFFLOAD_MAC || 329 macsec->offload == MACSEC_OFFLOAD_PHY) 330 return true; 331 332 return false; 333 } 334 335 /* Checks if underlying layers implement MACsec offloading functions. */ 336 static bool macsec_check_offload(enum macsec_offload offload, 337 struct macsec_dev *macsec) 338 { 339 if (!macsec || !macsec->real_dev) 340 return false; 341 342 if (offload == MACSEC_OFFLOAD_PHY) 343 return macsec->real_dev->phydev && 344 macsec->real_dev->phydev->macsec_ops; 345 else if (offload == MACSEC_OFFLOAD_MAC) 346 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 347 macsec->real_dev->macsec_ops; 348 349 return false; 350 } 351 352 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 353 struct macsec_dev *macsec, 354 struct macsec_context *ctx) 355 { 356 if (ctx) { 357 memset(ctx, 0, sizeof(*ctx)); 358 ctx->offload = offload; 359 360 if (offload == MACSEC_OFFLOAD_PHY) 361 ctx->phydev = macsec->real_dev->phydev; 362 else if (offload == MACSEC_OFFLOAD_MAC) 363 ctx->netdev = macsec->real_dev; 364 } 365 366 if (offload == MACSEC_OFFLOAD_PHY) 367 return macsec->real_dev->phydev->macsec_ops; 368 else 369 return macsec->real_dev->macsec_ops; 370 } 371 372 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 373 * context device reference if provided. 374 */ 375 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 376 struct macsec_context *ctx) 377 { 378 if (!macsec_check_offload(macsec->offload, macsec)) 379 return NULL; 380 381 return __macsec_get_ops(macsec->offload, macsec, ctx); 382 } 383 384 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 385 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 386 { 387 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 388 int len = skb->len - 2 * ETH_ALEN; 389 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 390 391 /* a) It comprises at least 17 octets */ 392 if (skb->len <= 16) 393 return false; 394 395 /* b) MACsec EtherType: already checked */ 396 397 /* c) V bit is clear */ 398 if (h->tci_an & MACSEC_TCI_VERSION) 399 return false; 400 401 /* d) ES or SCB => !SC */ 402 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 403 (h->tci_an & MACSEC_TCI_SC)) 404 return false; 405 406 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 407 if (h->unused) 408 return false; 409 410 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 411 if (!h->packet_number && !xpn) 412 return false; 413 414 /* length check, f) g) h) i) */ 415 if (h->short_length) 416 return len == extra_len + h->short_length; 417 return len >= extra_len + MIN_NON_SHORT_LEN; 418 } 419 420 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 421 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 422 423 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 424 salt_t salt) 425 { 426 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 427 428 gcm_iv->ssci = ssci ^ salt.ssci; 429 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 430 } 431 432 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 433 { 434 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 435 436 gcm_iv->sci = sci; 437 gcm_iv->pn = htonl(pn); 438 } 439 440 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 441 { 442 return (struct macsec_eth_header *)skb_mac_header(skb); 443 } 444 445 static void __macsec_pn_wrapped(struct macsec_secy *secy, 446 struct macsec_tx_sa *tx_sa) 447 { 448 pr_debug("PN wrapped, transitioning to !oper\n"); 449 tx_sa->active = false; 450 if (secy->protect_frames) 451 secy->operational = false; 452 } 453 454 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 455 { 456 spin_lock_bh(&tx_sa->lock); 457 __macsec_pn_wrapped(secy, tx_sa); 458 spin_unlock_bh(&tx_sa->lock); 459 } 460 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 461 462 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 463 struct macsec_secy *secy) 464 { 465 pn_t pn; 466 467 spin_lock_bh(&tx_sa->lock); 468 469 pn = tx_sa->next_pn_halves; 470 if (secy->xpn) 471 tx_sa->next_pn++; 472 else 473 tx_sa->next_pn_halves.lower++; 474 475 if (tx_sa->next_pn == 0) 476 __macsec_pn_wrapped(secy, tx_sa); 477 spin_unlock_bh(&tx_sa->lock); 478 479 return pn; 480 } 481 482 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 483 { 484 struct macsec_dev *macsec = netdev_priv(dev); 485 486 skb->dev = macsec->real_dev; 487 skb_reset_mac_header(skb); 488 skb->protocol = eth_hdr(skb)->h_proto; 489 } 490 491 static unsigned int macsec_msdu_len(struct sk_buff *skb) 492 { 493 struct macsec_dev *macsec = macsec_priv(skb->dev); 494 struct macsec_secy *secy = &macsec->secy; 495 bool sci_present = macsec_skb_cb(skb)->has_sci; 496 497 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 498 } 499 500 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 501 struct macsec_tx_sa *tx_sa) 502 { 503 unsigned int msdu_len = macsec_msdu_len(skb); 504 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 505 506 u64_stats_update_begin(&txsc_stats->syncp); 507 if (tx_sc->encrypt) { 508 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 509 txsc_stats->stats.OutPktsEncrypted++; 510 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 511 } else { 512 txsc_stats->stats.OutOctetsProtected += msdu_len; 513 txsc_stats->stats.OutPktsProtected++; 514 this_cpu_inc(tx_sa->stats->OutPktsProtected); 515 } 516 u64_stats_update_end(&txsc_stats->syncp); 517 } 518 519 static void count_tx(struct net_device *dev, int ret, int len) 520 { 521 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 522 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 523 524 u64_stats_update_begin(&stats->syncp); 525 u64_stats_inc(&stats->tx_packets); 526 u64_stats_add(&stats->tx_bytes, len); 527 u64_stats_update_end(&stats->syncp); 528 } 529 } 530 531 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 532 { 533 struct sk_buff *skb = base->data; 534 struct net_device *dev = skb->dev; 535 struct macsec_dev *macsec = macsec_priv(dev); 536 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 537 int len, ret; 538 539 aead_request_free(macsec_skb_cb(skb)->req); 540 541 rcu_read_lock_bh(); 542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 543 /* packet is encrypted/protected so tx_bytes must be calculated */ 544 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 545 macsec_encrypt_finish(skb, dev); 546 ret = dev_queue_xmit(skb); 547 count_tx(dev, ret, len); 548 rcu_read_unlock_bh(); 549 550 macsec_txsa_put(sa); 551 dev_put(dev); 552 } 553 554 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 555 unsigned char **iv, 556 struct scatterlist **sg, 557 int num_frags) 558 { 559 size_t size, iv_offset, sg_offset; 560 struct aead_request *req; 561 void *tmp; 562 563 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 564 iv_offset = size; 565 size += GCM_AES_IV_LEN; 566 567 size = ALIGN(size, __alignof__(struct scatterlist)); 568 sg_offset = size; 569 size += sizeof(struct scatterlist) * num_frags; 570 571 tmp = kmalloc(size, GFP_ATOMIC); 572 if (!tmp) 573 return NULL; 574 575 *iv = (unsigned char *)(tmp + iv_offset); 576 *sg = (struct scatterlist *)(tmp + sg_offset); 577 req = tmp; 578 579 aead_request_set_tfm(req, tfm); 580 581 return req; 582 } 583 584 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 585 struct net_device *dev) 586 { 587 int ret; 588 struct scatterlist *sg; 589 struct sk_buff *trailer; 590 unsigned char *iv; 591 struct ethhdr *eth; 592 struct macsec_eth_header *hh; 593 size_t unprotected_len; 594 struct aead_request *req; 595 struct macsec_secy *secy; 596 struct macsec_tx_sc *tx_sc; 597 struct macsec_tx_sa *tx_sa; 598 struct macsec_dev *macsec = macsec_priv(dev); 599 bool sci_present; 600 pn_t pn; 601 602 secy = &macsec->secy; 603 tx_sc = &secy->tx_sc; 604 605 /* 10.5.1 TX SA assignment */ 606 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 607 if (!tx_sa) { 608 secy->operational = false; 609 kfree_skb(skb); 610 return ERR_PTR(-EINVAL); 611 } 612 613 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 614 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 615 struct sk_buff *nskb = skb_copy_expand(skb, 616 MACSEC_NEEDED_HEADROOM, 617 MACSEC_NEEDED_TAILROOM, 618 GFP_ATOMIC); 619 if (likely(nskb)) { 620 consume_skb(skb); 621 skb = nskb; 622 } else { 623 macsec_txsa_put(tx_sa); 624 kfree_skb(skb); 625 return ERR_PTR(-ENOMEM); 626 } 627 } else { 628 skb = skb_unshare(skb, GFP_ATOMIC); 629 if (!skb) { 630 macsec_txsa_put(tx_sa); 631 return ERR_PTR(-ENOMEM); 632 } 633 } 634 635 unprotected_len = skb->len; 636 eth = eth_hdr(skb); 637 sci_present = macsec_send_sci(secy); 638 hh = skb_push(skb, macsec_extra_len(sci_present)); 639 memmove(hh, eth, 2 * ETH_ALEN); 640 641 pn = tx_sa_update_pn(tx_sa, secy); 642 if (pn.full64 == 0) { 643 macsec_txsa_put(tx_sa); 644 kfree_skb(skb); 645 return ERR_PTR(-ENOLINK); 646 } 647 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 648 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 649 650 skb_put(skb, secy->icv_len); 651 652 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 653 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 654 655 u64_stats_update_begin(&secy_stats->syncp); 656 secy_stats->stats.OutPktsTooLong++; 657 u64_stats_update_end(&secy_stats->syncp); 658 659 macsec_txsa_put(tx_sa); 660 kfree_skb(skb); 661 return ERR_PTR(-EINVAL); 662 } 663 664 ret = skb_cow_data(skb, 0, &trailer); 665 if (unlikely(ret < 0)) { 666 macsec_txsa_put(tx_sa); 667 kfree_skb(skb); 668 return ERR_PTR(ret); 669 } 670 671 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 672 if (!req) { 673 macsec_txsa_put(tx_sa); 674 kfree_skb(skb); 675 return ERR_PTR(-ENOMEM); 676 } 677 678 if (secy->xpn) 679 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 680 else 681 macsec_fill_iv(iv, secy->sci, pn.lower); 682 683 sg_init_table(sg, ret); 684 ret = skb_to_sgvec(skb, sg, 0, skb->len); 685 if (unlikely(ret < 0)) { 686 aead_request_free(req); 687 macsec_txsa_put(tx_sa); 688 kfree_skb(skb); 689 return ERR_PTR(ret); 690 } 691 692 if (tx_sc->encrypt) { 693 int len = skb->len - macsec_hdr_len(sci_present) - 694 secy->icv_len; 695 aead_request_set_crypt(req, sg, sg, len, iv); 696 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 697 } else { 698 aead_request_set_crypt(req, sg, sg, 0, iv); 699 aead_request_set_ad(req, skb->len - secy->icv_len); 700 } 701 702 macsec_skb_cb(skb)->req = req; 703 macsec_skb_cb(skb)->tx_sa = tx_sa; 704 macsec_skb_cb(skb)->has_sci = sci_present; 705 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 706 707 dev_hold(skb->dev); 708 ret = crypto_aead_encrypt(req); 709 if (ret == -EINPROGRESS) { 710 return ERR_PTR(ret); 711 } else if (ret != 0) { 712 dev_put(skb->dev); 713 kfree_skb(skb); 714 aead_request_free(req); 715 macsec_txsa_put(tx_sa); 716 return ERR_PTR(-EINVAL); 717 } 718 719 dev_put(skb->dev); 720 aead_request_free(req); 721 macsec_txsa_put(tx_sa); 722 723 return skb; 724 } 725 726 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 727 { 728 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 729 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 730 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 731 u32 lowest_pn = 0; 732 733 spin_lock(&rx_sa->lock); 734 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 735 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 736 737 /* Now perform replay protection check again 738 * (see IEEE 802.1AE-2006 figure 10-5) 739 */ 740 if (secy->replay_protect && pn < lowest_pn && 741 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 742 spin_unlock(&rx_sa->lock); 743 u64_stats_update_begin(&rxsc_stats->syncp); 744 rxsc_stats->stats.InPktsLate++; 745 u64_stats_update_end(&rxsc_stats->syncp); 746 secy->netdev->stats.rx_dropped++; 747 return false; 748 } 749 750 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 751 unsigned int msdu_len = macsec_msdu_len(skb); 752 u64_stats_update_begin(&rxsc_stats->syncp); 753 if (hdr->tci_an & MACSEC_TCI_E) 754 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 755 else 756 rxsc_stats->stats.InOctetsValidated += msdu_len; 757 u64_stats_update_end(&rxsc_stats->syncp); 758 } 759 760 if (!macsec_skb_cb(skb)->valid) { 761 spin_unlock(&rx_sa->lock); 762 763 /* 10.6.5 */ 764 if (hdr->tci_an & MACSEC_TCI_C || 765 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 766 u64_stats_update_begin(&rxsc_stats->syncp); 767 rxsc_stats->stats.InPktsNotValid++; 768 u64_stats_update_end(&rxsc_stats->syncp); 769 this_cpu_inc(rx_sa->stats->InPktsNotValid); 770 secy->netdev->stats.rx_errors++; 771 return false; 772 } 773 774 u64_stats_update_begin(&rxsc_stats->syncp); 775 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 776 rxsc_stats->stats.InPktsInvalid++; 777 this_cpu_inc(rx_sa->stats->InPktsInvalid); 778 } else if (pn < lowest_pn) { 779 rxsc_stats->stats.InPktsDelayed++; 780 } else { 781 rxsc_stats->stats.InPktsUnchecked++; 782 } 783 u64_stats_update_end(&rxsc_stats->syncp); 784 } else { 785 u64_stats_update_begin(&rxsc_stats->syncp); 786 if (pn < lowest_pn) { 787 rxsc_stats->stats.InPktsDelayed++; 788 } else { 789 rxsc_stats->stats.InPktsOK++; 790 this_cpu_inc(rx_sa->stats->InPktsOK); 791 } 792 u64_stats_update_end(&rxsc_stats->syncp); 793 794 // Instead of "pn >=" - to support pn overflow in xpn 795 if (pn + 1 > rx_sa->next_pn_halves.lower) { 796 rx_sa->next_pn_halves.lower = pn + 1; 797 } else if (secy->xpn && 798 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 799 rx_sa->next_pn_halves.upper++; 800 rx_sa->next_pn_halves.lower = pn + 1; 801 } 802 803 spin_unlock(&rx_sa->lock); 804 } 805 806 return true; 807 } 808 809 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 810 { 811 skb->pkt_type = PACKET_HOST; 812 skb->protocol = eth_type_trans(skb, dev); 813 814 skb_reset_network_header(skb); 815 if (!skb_transport_header_was_set(skb)) 816 skb_reset_transport_header(skb); 817 skb_reset_mac_len(skb); 818 } 819 820 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 821 { 822 skb->ip_summed = CHECKSUM_NONE; 823 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 824 skb_pull(skb, hdr_len); 825 pskb_trim_unique(skb, skb->len - icv_len); 826 } 827 828 static void count_rx(struct net_device *dev, int len) 829 { 830 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 831 832 u64_stats_update_begin(&stats->syncp); 833 u64_stats_inc(&stats->rx_packets); 834 u64_stats_add(&stats->rx_bytes, len); 835 u64_stats_update_end(&stats->syncp); 836 } 837 838 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 839 { 840 struct sk_buff *skb = base->data; 841 struct net_device *dev = skb->dev; 842 struct macsec_dev *macsec = macsec_priv(dev); 843 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 844 struct macsec_rx_sc *rx_sc = rx_sa->sc; 845 int len; 846 u32 pn; 847 848 aead_request_free(macsec_skb_cb(skb)->req); 849 850 if (!err) 851 macsec_skb_cb(skb)->valid = true; 852 853 rcu_read_lock_bh(); 854 pn = ntohl(macsec_ethhdr(skb)->packet_number); 855 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 856 rcu_read_unlock_bh(); 857 kfree_skb(skb); 858 goto out; 859 } 860 861 macsec_finalize_skb(skb, macsec->secy.icv_len, 862 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 863 len = skb->len; 864 macsec_reset_skb(skb, macsec->secy.netdev); 865 866 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 867 count_rx(dev, len); 868 869 rcu_read_unlock_bh(); 870 871 out: 872 macsec_rxsa_put(rx_sa); 873 macsec_rxsc_put(rx_sc); 874 dev_put(dev); 875 } 876 877 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 878 struct net_device *dev, 879 struct macsec_rx_sa *rx_sa, 880 sci_t sci, 881 struct macsec_secy *secy) 882 { 883 int ret; 884 struct scatterlist *sg; 885 struct sk_buff *trailer; 886 unsigned char *iv; 887 struct aead_request *req; 888 struct macsec_eth_header *hdr; 889 u32 hdr_pn; 890 u16 icv_len = secy->icv_len; 891 892 macsec_skb_cb(skb)->valid = false; 893 skb = skb_share_check(skb, GFP_ATOMIC); 894 if (!skb) 895 return ERR_PTR(-ENOMEM); 896 897 ret = skb_cow_data(skb, 0, &trailer); 898 if (unlikely(ret < 0)) { 899 kfree_skb(skb); 900 return ERR_PTR(ret); 901 } 902 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 903 if (!req) { 904 kfree_skb(skb); 905 return ERR_PTR(-ENOMEM); 906 } 907 908 hdr = (struct macsec_eth_header *)skb->data; 909 hdr_pn = ntohl(hdr->packet_number); 910 911 if (secy->xpn) { 912 pn_t recovered_pn = rx_sa->next_pn_halves; 913 914 recovered_pn.lower = hdr_pn; 915 if (hdr_pn < rx_sa->next_pn_halves.lower && 916 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 917 recovered_pn.upper++; 918 919 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 920 rx_sa->key.salt); 921 } else { 922 macsec_fill_iv(iv, sci, hdr_pn); 923 } 924 925 sg_init_table(sg, ret); 926 ret = skb_to_sgvec(skb, sg, 0, skb->len); 927 if (unlikely(ret < 0)) { 928 aead_request_free(req); 929 kfree_skb(skb); 930 return ERR_PTR(ret); 931 } 932 933 if (hdr->tci_an & MACSEC_TCI_E) { 934 /* confidentiality: ethernet + macsec header 935 * authenticated, encrypted payload 936 */ 937 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 938 939 aead_request_set_crypt(req, sg, sg, len, iv); 940 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 941 skb = skb_unshare(skb, GFP_ATOMIC); 942 if (!skb) { 943 aead_request_free(req); 944 return ERR_PTR(-ENOMEM); 945 } 946 } else { 947 /* integrity only: all headers + data authenticated */ 948 aead_request_set_crypt(req, sg, sg, icv_len, iv); 949 aead_request_set_ad(req, skb->len - icv_len); 950 } 951 952 macsec_skb_cb(skb)->req = req; 953 skb->dev = dev; 954 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 955 956 dev_hold(dev); 957 ret = crypto_aead_decrypt(req); 958 if (ret == -EINPROGRESS) { 959 return ERR_PTR(ret); 960 } else if (ret != 0) { 961 /* decryption/authentication failed 962 * 10.6 if validateFrames is disabled, deliver anyway 963 */ 964 if (ret != -EBADMSG) { 965 kfree_skb(skb); 966 skb = ERR_PTR(ret); 967 } 968 } else { 969 macsec_skb_cb(skb)->valid = true; 970 } 971 dev_put(dev); 972 973 aead_request_free(req); 974 975 return skb; 976 } 977 978 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 979 { 980 struct macsec_rx_sc *rx_sc; 981 982 for_each_rxsc(secy, rx_sc) { 983 if (rx_sc->sci == sci) 984 return rx_sc; 985 } 986 987 return NULL; 988 } 989 990 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 991 { 992 struct macsec_rx_sc *rx_sc; 993 994 for_each_rxsc_rtnl(secy, rx_sc) { 995 if (rx_sc->sci == sci) 996 return rx_sc; 997 } 998 999 return NULL; 1000 } 1001 1002 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 1003 { 1004 /* Deliver to the uncontrolled port by default */ 1005 enum rx_handler_result ret = RX_HANDLER_PASS; 1006 struct ethhdr *hdr = eth_hdr(skb); 1007 struct metadata_dst *md_dst; 1008 struct macsec_rxh_data *rxd; 1009 struct macsec_dev *macsec; 1010 1011 rcu_read_lock(); 1012 rxd = macsec_data_rcu(skb->dev); 1013 md_dst = skb_metadata_dst(skb); 1014 1015 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1016 struct sk_buff *nskb; 1017 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1018 struct net_device *ndev = macsec->secy.netdev; 1019 1020 /* If h/w offloading is enabled, HW decodes frames and strips 1021 * the SecTAG, so we have to deduce which port to deliver to. 1022 */ 1023 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1024 if (md_dst && md_dst->type == METADATA_MACSEC && 1025 (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci))) 1026 continue; 1027 1028 if (ether_addr_equal_64bits(hdr->h_dest, 1029 ndev->dev_addr)) { 1030 /* exact match, divert skb to this port */ 1031 skb->dev = ndev; 1032 skb->pkt_type = PACKET_HOST; 1033 ret = RX_HANDLER_ANOTHER; 1034 goto out; 1035 } else if (is_multicast_ether_addr_64bits( 1036 hdr->h_dest)) { 1037 /* multicast frame, deliver on this port too */ 1038 nskb = skb_clone(skb, GFP_ATOMIC); 1039 if (!nskb) 1040 break; 1041 1042 nskb->dev = ndev; 1043 if (ether_addr_equal_64bits(hdr->h_dest, 1044 ndev->broadcast)) 1045 nskb->pkt_type = PACKET_BROADCAST; 1046 else 1047 nskb->pkt_type = PACKET_MULTICAST; 1048 1049 __netif_rx(nskb); 1050 } 1051 continue; 1052 } 1053 1054 /* 10.6 If the management control validateFrames is not 1055 * Strict, frames without a SecTAG are received, counted, and 1056 * delivered to the Controlled Port 1057 */ 1058 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1059 u64_stats_update_begin(&secy_stats->syncp); 1060 secy_stats->stats.InPktsNoTag++; 1061 u64_stats_update_end(&secy_stats->syncp); 1062 macsec->secy.netdev->stats.rx_dropped++; 1063 continue; 1064 } 1065 1066 /* deliver on this port */ 1067 nskb = skb_clone(skb, GFP_ATOMIC); 1068 if (!nskb) 1069 break; 1070 1071 nskb->dev = ndev; 1072 1073 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1074 u64_stats_update_begin(&secy_stats->syncp); 1075 secy_stats->stats.InPktsUntagged++; 1076 u64_stats_update_end(&secy_stats->syncp); 1077 } 1078 } 1079 1080 out: 1081 rcu_read_unlock(); 1082 return ret; 1083 } 1084 1085 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1086 { 1087 struct sk_buff *skb = *pskb; 1088 struct net_device *dev = skb->dev; 1089 struct macsec_eth_header *hdr; 1090 struct macsec_secy *secy = NULL; 1091 struct macsec_rx_sc *rx_sc; 1092 struct macsec_rx_sa *rx_sa; 1093 struct macsec_rxh_data *rxd; 1094 struct macsec_dev *macsec; 1095 unsigned int len; 1096 sci_t sci; 1097 u32 hdr_pn; 1098 bool cbit; 1099 struct pcpu_rx_sc_stats *rxsc_stats; 1100 struct pcpu_secy_stats *secy_stats; 1101 bool pulled_sci; 1102 int ret; 1103 1104 if (skb_headroom(skb) < ETH_HLEN) 1105 goto drop_direct; 1106 1107 hdr = macsec_ethhdr(skb); 1108 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1109 return handle_not_macsec(skb); 1110 1111 skb = skb_unshare(skb, GFP_ATOMIC); 1112 *pskb = skb; 1113 if (!skb) 1114 return RX_HANDLER_CONSUMED; 1115 1116 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1117 if (!pulled_sci) { 1118 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1119 goto drop_direct; 1120 } 1121 1122 hdr = macsec_ethhdr(skb); 1123 1124 /* Frames with a SecTAG that has the TCI E bit set but the C 1125 * bit clear are discarded, as this reserved encoding is used 1126 * to identify frames with a SecTAG that are not to be 1127 * delivered to the Controlled Port. 1128 */ 1129 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1130 return RX_HANDLER_PASS; 1131 1132 /* now, pull the extra length */ 1133 if (hdr->tci_an & MACSEC_TCI_SC) { 1134 if (!pulled_sci) 1135 goto drop_direct; 1136 } 1137 1138 /* ethernet header is part of crypto processing */ 1139 skb_push(skb, ETH_HLEN); 1140 1141 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1142 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1143 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1144 1145 rcu_read_lock(); 1146 rxd = macsec_data_rcu(skb->dev); 1147 1148 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1149 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1150 1151 sc = sc ? macsec_rxsc_get(sc) : NULL; 1152 1153 if (sc) { 1154 secy = &macsec->secy; 1155 rx_sc = sc; 1156 break; 1157 } 1158 } 1159 1160 if (!secy) 1161 goto nosci; 1162 1163 dev = secy->netdev; 1164 macsec = macsec_priv(dev); 1165 secy_stats = this_cpu_ptr(macsec->stats); 1166 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1167 1168 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1169 u64_stats_update_begin(&secy_stats->syncp); 1170 secy_stats->stats.InPktsBadTag++; 1171 u64_stats_update_end(&secy_stats->syncp); 1172 secy->netdev->stats.rx_errors++; 1173 goto drop_nosa; 1174 } 1175 1176 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1177 if (!rx_sa) { 1178 /* 10.6.1 if the SA is not in use */ 1179 1180 /* If validateFrames is Strict or the C bit in the 1181 * SecTAG is set, discard 1182 */ 1183 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc); 1184 if (hdr->tci_an & MACSEC_TCI_C || 1185 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1186 u64_stats_update_begin(&rxsc_stats->syncp); 1187 rxsc_stats->stats.InPktsNotUsingSA++; 1188 u64_stats_update_end(&rxsc_stats->syncp); 1189 secy->netdev->stats.rx_errors++; 1190 if (active_rx_sa) 1191 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA); 1192 goto drop_nosa; 1193 } 1194 1195 /* not Strict, the frame (with the SecTAG and ICV 1196 * removed) is delivered to the Controlled Port. 1197 */ 1198 u64_stats_update_begin(&rxsc_stats->syncp); 1199 rxsc_stats->stats.InPktsUnusedSA++; 1200 u64_stats_update_end(&rxsc_stats->syncp); 1201 if (active_rx_sa) 1202 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA); 1203 goto deliver; 1204 } 1205 1206 /* First, PN check to avoid decrypting obviously wrong packets */ 1207 hdr_pn = ntohl(hdr->packet_number); 1208 if (secy->replay_protect) { 1209 bool late; 1210 1211 spin_lock(&rx_sa->lock); 1212 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1213 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1214 1215 if (secy->xpn) 1216 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1217 spin_unlock(&rx_sa->lock); 1218 1219 if (late) { 1220 u64_stats_update_begin(&rxsc_stats->syncp); 1221 rxsc_stats->stats.InPktsLate++; 1222 u64_stats_update_end(&rxsc_stats->syncp); 1223 macsec->secy.netdev->stats.rx_dropped++; 1224 goto drop; 1225 } 1226 } 1227 1228 macsec_skb_cb(skb)->rx_sa = rx_sa; 1229 1230 /* Disabled && !changed text => skip validation */ 1231 if (hdr->tci_an & MACSEC_TCI_C || 1232 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1233 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1234 1235 if (IS_ERR(skb)) { 1236 /* the decrypt callback needs the reference */ 1237 if (PTR_ERR(skb) != -EINPROGRESS) { 1238 macsec_rxsa_put(rx_sa); 1239 macsec_rxsc_put(rx_sc); 1240 } 1241 rcu_read_unlock(); 1242 *pskb = NULL; 1243 return RX_HANDLER_CONSUMED; 1244 } 1245 1246 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1247 goto drop; 1248 1249 deliver: 1250 macsec_finalize_skb(skb, secy->icv_len, 1251 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1252 len = skb->len; 1253 macsec_reset_skb(skb, secy->netdev); 1254 1255 if (rx_sa) 1256 macsec_rxsa_put(rx_sa); 1257 macsec_rxsc_put(rx_sc); 1258 1259 skb_orphan(skb); 1260 ret = gro_cells_receive(&macsec->gro_cells, skb); 1261 if (ret == NET_RX_SUCCESS) 1262 count_rx(dev, len); 1263 else 1264 macsec->secy.netdev->stats.rx_dropped++; 1265 1266 rcu_read_unlock(); 1267 1268 *pskb = NULL; 1269 return RX_HANDLER_CONSUMED; 1270 1271 drop: 1272 macsec_rxsa_put(rx_sa); 1273 drop_nosa: 1274 macsec_rxsc_put(rx_sc); 1275 rcu_read_unlock(); 1276 drop_direct: 1277 kfree_skb(skb); 1278 *pskb = NULL; 1279 return RX_HANDLER_CONSUMED; 1280 1281 nosci: 1282 /* 10.6.1 if the SC is not found */ 1283 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1284 if (!cbit) 1285 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1286 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1287 1288 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1289 struct sk_buff *nskb; 1290 1291 secy_stats = this_cpu_ptr(macsec->stats); 1292 1293 /* If validateFrames is Strict or the C bit in the 1294 * SecTAG is set, discard 1295 */ 1296 if (cbit || 1297 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1298 u64_stats_update_begin(&secy_stats->syncp); 1299 secy_stats->stats.InPktsNoSCI++; 1300 u64_stats_update_end(&secy_stats->syncp); 1301 macsec->secy.netdev->stats.rx_errors++; 1302 continue; 1303 } 1304 1305 /* not strict, the frame (with the SecTAG and ICV 1306 * removed) is delivered to the Controlled Port. 1307 */ 1308 nskb = skb_clone(skb, GFP_ATOMIC); 1309 if (!nskb) 1310 break; 1311 1312 macsec_reset_skb(nskb, macsec->secy.netdev); 1313 1314 ret = __netif_rx(nskb); 1315 if (ret == NET_RX_SUCCESS) { 1316 u64_stats_update_begin(&secy_stats->syncp); 1317 secy_stats->stats.InPktsUnknownSCI++; 1318 u64_stats_update_end(&secy_stats->syncp); 1319 } else { 1320 macsec->secy.netdev->stats.rx_dropped++; 1321 } 1322 } 1323 1324 rcu_read_unlock(); 1325 *pskb = skb; 1326 return RX_HANDLER_PASS; 1327 } 1328 1329 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1330 { 1331 struct crypto_aead *tfm; 1332 int ret; 1333 1334 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */ 1335 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1336 1337 if (IS_ERR(tfm)) 1338 return tfm; 1339 1340 ret = crypto_aead_setkey(tfm, key, key_len); 1341 if (ret < 0) 1342 goto fail; 1343 1344 ret = crypto_aead_setauthsize(tfm, icv_len); 1345 if (ret < 0) 1346 goto fail; 1347 1348 return tfm; 1349 fail: 1350 crypto_free_aead(tfm); 1351 return ERR_PTR(ret); 1352 } 1353 1354 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1355 int icv_len) 1356 { 1357 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1358 if (!rx_sa->stats) 1359 return -ENOMEM; 1360 1361 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1362 if (IS_ERR(rx_sa->key.tfm)) { 1363 free_percpu(rx_sa->stats); 1364 return PTR_ERR(rx_sa->key.tfm); 1365 } 1366 1367 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1368 rx_sa->active = false; 1369 rx_sa->next_pn = 1; 1370 refcount_set(&rx_sa->refcnt, 1); 1371 spin_lock_init(&rx_sa->lock); 1372 1373 return 0; 1374 } 1375 1376 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1377 { 1378 rx_sa->active = false; 1379 1380 macsec_rxsa_put(rx_sa); 1381 } 1382 1383 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1384 { 1385 int i; 1386 1387 for (i = 0; i < MACSEC_NUM_AN; i++) { 1388 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1389 1390 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1391 if (sa) 1392 clear_rx_sa(sa); 1393 } 1394 1395 macsec_rxsc_put(rx_sc); 1396 } 1397 1398 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1399 { 1400 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1401 1402 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1403 rx_sc; 1404 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1405 if (rx_sc->sci == sci) { 1406 if (rx_sc->active) 1407 secy->n_rx_sc--; 1408 rcu_assign_pointer(*rx_scp, rx_sc->next); 1409 return rx_sc; 1410 } 1411 } 1412 1413 return NULL; 1414 } 1415 1416 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1417 { 1418 struct macsec_rx_sc *rx_sc; 1419 struct macsec_dev *macsec; 1420 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1421 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1422 struct macsec_secy *secy; 1423 1424 list_for_each_entry(macsec, &rxd->secys, secys) { 1425 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1426 return ERR_PTR(-EEXIST); 1427 } 1428 1429 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1430 if (!rx_sc) 1431 return ERR_PTR(-ENOMEM); 1432 1433 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1434 if (!rx_sc->stats) { 1435 kfree(rx_sc); 1436 return ERR_PTR(-ENOMEM); 1437 } 1438 1439 rx_sc->sci = sci; 1440 rx_sc->active = true; 1441 refcount_set(&rx_sc->refcnt, 1); 1442 1443 secy = &macsec_priv(dev)->secy; 1444 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1445 rcu_assign_pointer(secy->rx_sc, rx_sc); 1446 1447 if (rx_sc->active) 1448 secy->n_rx_sc++; 1449 1450 return rx_sc; 1451 } 1452 1453 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1454 int icv_len) 1455 { 1456 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1457 if (!tx_sa->stats) 1458 return -ENOMEM; 1459 1460 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1461 if (IS_ERR(tx_sa->key.tfm)) { 1462 free_percpu(tx_sa->stats); 1463 return PTR_ERR(tx_sa->key.tfm); 1464 } 1465 1466 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1467 tx_sa->active = false; 1468 refcount_set(&tx_sa->refcnt, 1); 1469 spin_lock_init(&tx_sa->lock); 1470 1471 return 0; 1472 } 1473 1474 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1475 { 1476 tx_sa->active = false; 1477 1478 macsec_txsa_put(tx_sa); 1479 } 1480 1481 static struct genl_family macsec_fam; 1482 1483 static struct net_device *get_dev_from_nl(struct net *net, 1484 struct nlattr **attrs) 1485 { 1486 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1487 struct net_device *dev; 1488 1489 dev = __dev_get_by_index(net, ifindex); 1490 if (!dev) 1491 return ERR_PTR(-ENODEV); 1492 1493 if (!netif_is_macsec(dev)) 1494 return ERR_PTR(-ENODEV); 1495 1496 return dev; 1497 } 1498 1499 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1500 { 1501 return (__force enum macsec_offload)nla_get_u8(nla); 1502 } 1503 1504 static sci_t nla_get_sci(const struct nlattr *nla) 1505 { 1506 return (__force sci_t)nla_get_u64(nla); 1507 } 1508 1509 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1510 int padattr) 1511 { 1512 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1513 } 1514 1515 static ssci_t nla_get_ssci(const struct nlattr *nla) 1516 { 1517 return (__force ssci_t)nla_get_u32(nla); 1518 } 1519 1520 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1521 { 1522 return nla_put_u32(skb, attrtype, (__force u64)value); 1523 } 1524 1525 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1526 struct nlattr **attrs, 1527 struct nlattr **tb_sa, 1528 struct net_device **devp, 1529 struct macsec_secy **secyp, 1530 struct macsec_tx_sc **scp, 1531 u8 *assoc_num) 1532 { 1533 struct net_device *dev; 1534 struct macsec_secy *secy; 1535 struct macsec_tx_sc *tx_sc; 1536 struct macsec_tx_sa *tx_sa; 1537 1538 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1539 return ERR_PTR(-EINVAL); 1540 1541 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1542 1543 dev = get_dev_from_nl(net, attrs); 1544 if (IS_ERR(dev)) 1545 return ERR_CAST(dev); 1546 1547 if (*assoc_num >= MACSEC_NUM_AN) 1548 return ERR_PTR(-EINVAL); 1549 1550 secy = &macsec_priv(dev)->secy; 1551 tx_sc = &secy->tx_sc; 1552 1553 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1554 if (!tx_sa) 1555 return ERR_PTR(-ENODEV); 1556 1557 *devp = dev; 1558 *scp = tx_sc; 1559 *secyp = secy; 1560 return tx_sa; 1561 } 1562 1563 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1564 struct nlattr **attrs, 1565 struct nlattr **tb_rxsc, 1566 struct net_device **devp, 1567 struct macsec_secy **secyp) 1568 { 1569 struct net_device *dev; 1570 struct macsec_secy *secy; 1571 struct macsec_rx_sc *rx_sc; 1572 sci_t sci; 1573 1574 dev = get_dev_from_nl(net, attrs); 1575 if (IS_ERR(dev)) 1576 return ERR_CAST(dev); 1577 1578 secy = &macsec_priv(dev)->secy; 1579 1580 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1581 return ERR_PTR(-EINVAL); 1582 1583 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1584 rx_sc = find_rx_sc_rtnl(secy, sci); 1585 if (!rx_sc) 1586 return ERR_PTR(-ENODEV); 1587 1588 *secyp = secy; 1589 *devp = dev; 1590 1591 return rx_sc; 1592 } 1593 1594 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1595 struct nlattr **attrs, 1596 struct nlattr **tb_rxsc, 1597 struct nlattr **tb_sa, 1598 struct net_device **devp, 1599 struct macsec_secy **secyp, 1600 struct macsec_rx_sc **scp, 1601 u8 *assoc_num) 1602 { 1603 struct macsec_rx_sc *rx_sc; 1604 struct macsec_rx_sa *rx_sa; 1605 1606 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1607 return ERR_PTR(-EINVAL); 1608 1609 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1610 if (*assoc_num >= MACSEC_NUM_AN) 1611 return ERR_PTR(-EINVAL); 1612 1613 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1614 if (IS_ERR(rx_sc)) 1615 return ERR_CAST(rx_sc); 1616 1617 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1618 if (!rx_sa) 1619 return ERR_PTR(-ENODEV); 1620 1621 *scp = rx_sc; 1622 return rx_sa; 1623 } 1624 1625 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1626 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1627 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1628 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1629 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1630 }; 1631 1632 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1633 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1634 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1635 }; 1636 1637 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1638 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1639 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1640 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1641 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1642 .len = MACSEC_KEYID_LEN, }, 1643 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1644 .len = MACSEC_MAX_KEY_LEN, }, 1645 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1646 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1647 .len = MACSEC_SALT_LEN, }, 1648 }; 1649 1650 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1651 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1652 }; 1653 1654 /* Offloads an operation to a device driver */ 1655 static int macsec_offload(int (* const func)(struct macsec_context *), 1656 struct macsec_context *ctx) 1657 { 1658 int ret; 1659 1660 if (unlikely(!func)) 1661 return 0; 1662 1663 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1664 mutex_lock(&ctx->phydev->lock); 1665 1666 /* Phase I: prepare. The drive should fail here if there are going to be 1667 * issues in the commit phase. 1668 */ 1669 ctx->prepare = true; 1670 ret = (*func)(ctx); 1671 if (ret) 1672 goto phy_unlock; 1673 1674 /* Phase II: commit. This step cannot fail. */ 1675 ctx->prepare = false; 1676 ret = (*func)(ctx); 1677 /* This should never happen: commit is not allowed to fail */ 1678 if (unlikely(ret)) 1679 WARN(1, "MACsec offloading commit failed (%d)\n", ret); 1680 1681 phy_unlock: 1682 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1683 mutex_unlock(&ctx->phydev->lock); 1684 1685 return ret; 1686 } 1687 1688 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1689 { 1690 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1691 return -EINVAL; 1692 1693 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1694 return -EINVAL; 1695 1696 return 0; 1697 } 1698 1699 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1700 { 1701 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1702 return -EINVAL; 1703 1704 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1705 return -EINVAL; 1706 1707 return 0; 1708 } 1709 1710 static bool validate_add_rxsa(struct nlattr **attrs) 1711 { 1712 if (!attrs[MACSEC_SA_ATTR_AN] || 1713 !attrs[MACSEC_SA_ATTR_KEY] || 1714 !attrs[MACSEC_SA_ATTR_KEYID]) 1715 return false; 1716 1717 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1718 return false; 1719 1720 if (attrs[MACSEC_SA_ATTR_PN] && 1721 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1722 return false; 1723 1724 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1725 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1726 return false; 1727 } 1728 1729 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1730 return false; 1731 1732 return true; 1733 } 1734 1735 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1736 { 1737 struct net_device *dev; 1738 struct nlattr **attrs = info->attrs; 1739 struct macsec_secy *secy; 1740 struct macsec_rx_sc *rx_sc; 1741 struct macsec_rx_sa *rx_sa; 1742 unsigned char assoc_num; 1743 int pn_len; 1744 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1745 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1746 int err; 1747 1748 if (!attrs[MACSEC_ATTR_IFINDEX]) 1749 return -EINVAL; 1750 1751 if (parse_sa_config(attrs, tb_sa)) 1752 return -EINVAL; 1753 1754 if (parse_rxsc_config(attrs, tb_rxsc)) 1755 return -EINVAL; 1756 1757 if (!validate_add_rxsa(tb_sa)) 1758 return -EINVAL; 1759 1760 rtnl_lock(); 1761 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1762 if (IS_ERR(rx_sc)) { 1763 rtnl_unlock(); 1764 return PTR_ERR(rx_sc); 1765 } 1766 1767 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1768 1769 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1770 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1771 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1772 rtnl_unlock(); 1773 return -EINVAL; 1774 } 1775 1776 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1777 if (tb_sa[MACSEC_SA_ATTR_PN] && 1778 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1779 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1780 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1781 rtnl_unlock(); 1782 return -EINVAL; 1783 } 1784 1785 if (secy->xpn) { 1786 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1787 rtnl_unlock(); 1788 return -EINVAL; 1789 } 1790 1791 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1792 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1793 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1794 MACSEC_SALT_LEN); 1795 rtnl_unlock(); 1796 return -EINVAL; 1797 } 1798 } 1799 1800 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1801 if (rx_sa) { 1802 rtnl_unlock(); 1803 return -EBUSY; 1804 } 1805 1806 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1807 if (!rx_sa) { 1808 rtnl_unlock(); 1809 return -ENOMEM; 1810 } 1811 1812 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1813 secy->key_len, secy->icv_len); 1814 if (err < 0) { 1815 kfree(rx_sa); 1816 rtnl_unlock(); 1817 return err; 1818 } 1819 1820 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1821 spin_lock_bh(&rx_sa->lock); 1822 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1823 spin_unlock_bh(&rx_sa->lock); 1824 } 1825 1826 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1827 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1828 1829 rx_sa->sc = rx_sc; 1830 1831 /* If h/w offloading is available, propagate to the device */ 1832 if (macsec_is_offloaded(netdev_priv(dev))) { 1833 const struct macsec_ops *ops; 1834 struct macsec_context ctx; 1835 1836 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1837 if (!ops) { 1838 err = -EOPNOTSUPP; 1839 goto cleanup; 1840 } 1841 1842 ctx.sa.assoc_num = assoc_num; 1843 ctx.sa.rx_sa = rx_sa; 1844 ctx.secy = secy; 1845 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1846 secy->key_len); 1847 1848 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1849 if (err) 1850 goto cleanup; 1851 } 1852 1853 if (secy->xpn) { 1854 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1855 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1856 MACSEC_SALT_LEN); 1857 } 1858 1859 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1860 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1861 1862 rtnl_unlock(); 1863 1864 return 0; 1865 1866 cleanup: 1867 macsec_rxsa_put(rx_sa); 1868 rtnl_unlock(); 1869 return err; 1870 } 1871 1872 static bool validate_add_rxsc(struct nlattr **attrs) 1873 { 1874 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1875 return false; 1876 1877 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1878 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1879 return false; 1880 } 1881 1882 return true; 1883 } 1884 1885 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1886 { 1887 struct net_device *dev; 1888 sci_t sci = MACSEC_UNDEF_SCI; 1889 struct nlattr **attrs = info->attrs; 1890 struct macsec_rx_sc *rx_sc; 1891 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1892 struct macsec_secy *secy; 1893 bool was_active; 1894 int ret; 1895 1896 if (!attrs[MACSEC_ATTR_IFINDEX]) 1897 return -EINVAL; 1898 1899 if (parse_rxsc_config(attrs, tb_rxsc)) 1900 return -EINVAL; 1901 1902 if (!validate_add_rxsc(tb_rxsc)) 1903 return -EINVAL; 1904 1905 rtnl_lock(); 1906 dev = get_dev_from_nl(genl_info_net(info), attrs); 1907 if (IS_ERR(dev)) { 1908 rtnl_unlock(); 1909 return PTR_ERR(dev); 1910 } 1911 1912 secy = &macsec_priv(dev)->secy; 1913 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1914 1915 rx_sc = create_rx_sc(dev, sci); 1916 if (IS_ERR(rx_sc)) { 1917 rtnl_unlock(); 1918 return PTR_ERR(rx_sc); 1919 } 1920 1921 was_active = rx_sc->active; 1922 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1923 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1924 1925 if (macsec_is_offloaded(netdev_priv(dev))) { 1926 const struct macsec_ops *ops; 1927 struct macsec_context ctx; 1928 1929 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1930 if (!ops) { 1931 ret = -EOPNOTSUPP; 1932 goto cleanup; 1933 } 1934 1935 ctx.rx_sc = rx_sc; 1936 ctx.secy = secy; 1937 1938 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1939 if (ret) 1940 goto cleanup; 1941 } 1942 1943 rtnl_unlock(); 1944 1945 return 0; 1946 1947 cleanup: 1948 rx_sc->active = was_active; 1949 rtnl_unlock(); 1950 return ret; 1951 } 1952 1953 static bool validate_add_txsa(struct nlattr **attrs) 1954 { 1955 if (!attrs[MACSEC_SA_ATTR_AN] || 1956 !attrs[MACSEC_SA_ATTR_PN] || 1957 !attrs[MACSEC_SA_ATTR_KEY] || 1958 !attrs[MACSEC_SA_ATTR_KEYID]) 1959 return false; 1960 1961 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1962 return false; 1963 1964 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1965 return false; 1966 1967 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1968 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1969 return false; 1970 } 1971 1972 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1973 return false; 1974 1975 return true; 1976 } 1977 1978 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1979 { 1980 struct net_device *dev; 1981 struct nlattr **attrs = info->attrs; 1982 struct macsec_secy *secy; 1983 struct macsec_tx_sc *tx_sc; 1984 struct macsec_tx_sa *tx_sa; 1985 unsigned char assoc_num; 1986 int pn_len; 1987 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1988 bool was_operational; 1989 int err; 1990 1991 if (!attrs[MACSEC_ATTR_IFINDEX]) 1992 return -EINVAL; 1993 1994 if (parse_sa_config(attrs, tb_sa)) 1995 return -EINVAL; 1996 1997 if (!validate_add_txsa(tb_sa)) 1998 return -EINVAL; 1999 2000 rtnl_lock(); 2001 dev = get_dev_from_nl(genl_info_net(info), attrs); 2002 if (IS_ERR(dev)) { 2003 rtnl_unlock(); 2004 return PTR_ERR(dev); 2005 } 2006 2007 secy = &macsec_priv(dev)->secy; 2008 tx_sc = &secy->tx_sc; 2009 2010 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 2011 2012 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 2013 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 2014 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2015 rtnl_unlock(); 2016 return -EINVAL; 2017 } 2018 2019 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2020 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2021 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2022 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2023 rtnl_unlock(); 2024 return -EINVAL; 2025 } 2026 2027 if (secy->xpn) { 2028 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2029 rtnl_unlock(); 2030 return -EINVAL; 2031 } 2032 2033 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2034 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2035 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2036 MACSEC_SALT_LEN); 2037 rtnl_unlock(); 2038 return -EINVAL; 2039 } 2040 } 2041 2042 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2043 if (tx_sa) { 2044 rtnl_unlock(); 2045 return -EBUSY; 2046 } 2047 2048 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2049 if (!tx_sa) { 2050 rtnl_unlock(); 2051 return -ENOMEM; 2052 } 2053 2054 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2055 secy->key_len, secy->icv_len); 2056 if (err < 0) { 2057 kfree(tx_sa); 2058 rtnl_unlock(); 2059 return err; 2060 } 2061 2062 spin_lock_bh(&tx_sa->lock); 2063 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2064 spin_unlock_bh(&tx_sa->lock); 2065 2066 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2067 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2068 2069 was_operational = secy->operational; 2070 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2071 secy->operational = true; 2072 2073 /* If h/w offloading is available, propagate to the device */ 2074 if (macsec_is_offloaded(netdev_priv(dev))) { 2075 const struct macsec_ops *ops; 2076 struct macsec_context ctx; 2077 2078 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2079 if (!ops) { 2080 err = -EOPNOTSUPP; 2081 goto cleanup; 2082 } 2083 2084 ctx.sa.assoc_num = assoc_num; 2085 ctx.sa.tx_sa = tx_sa; 2086 ctx.secy = secy; 2087 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2088 secy->key_len); 2089 2090 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2091 if (err) 2092 goto cleanup; 2093 } 2094 2095 if (secy->xpn) { 2096 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2097 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2098 MACSEC_SALT_LEN); 2099 } 2100 2101 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2102 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2103 2104 rtnl_unlock(); 2105 2106 return 0; 2107 2108 cleanup: 2109 secy->operational = was_operational; 2110 macsec_txsa_put(tx_sa); 2111 rtnl_unlock(); 2112 return err; 2113 } 2114 2115 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2116 { 2117 struct nlattr **attrs = info->attrs; 2118 struct net_device *dev; 2119 struct macsec_secy *secy; 2120 struct macsec_rx_sc *rx_sc; 2121 struct macsec_rx_sa *rx_sa; 2122 u8 assoc_num; 2123 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2124 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2125 int ret; 2126 2127 if (!attrs[MACSEC_ATTR_IFINDEX]) 2128 return -EINVAL; 2129 2130 if (parse_sa_config(attrs, tb_sa)) 2131 return -EINVAL; 2132 2133 if (parse_rxsc_config(attrs, tb_rxsc)) 2134 return -EINVAL; 2135 2136 rtnl_lock(); 2137 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2138 &dev, &secy, &rx_sc, &assoc_num); 2139 if (IS_ERR(rx_sa)) { 2140 rtnl_unlock(); 2141 return PTR_ERR(rx_sa); 2142 } 2143 2144 if (rx_sa->active) { 2145 rtnl_unlock(); 2146 return -EBUSY; 2147 } 2148 2149 /* If h/w offloading is available, propagate to the device */ 2150 if (macsec_is_offloaded(netdev_priv(dev))) { 2151 const struct macsec_ops *ops; 2152 struct macsec_context ctx; 2153 2154 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2155 if (!ops) { 2156 ret = -EOPNOTSUPP; 2157 goto cleanup; 2158 } 2159 2160 ctx.sa.assoc_num = assoc_num; 2161 ctx.sa.rx_sa = rx_sa; 2162 ctx.secy = secy; 2163 2164 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2165 if (ret) 2166 goto cleanup; 2167 } 2168 2169 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2170 clear_rx_sa(rx_sa); 2171 2172 rtnl_unlock(); 2173 2174 return 0; 2175 2176 cleanup: 2177 rtnl_unlock(); 2178 return ret; 2179 } 2180 2181 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2182 { 2183 struct nlattr **attrs = info->attrs; 2184 struct net_device *dev; 2185 struct macsec_secy *secy; 2186 struct macsec_rx_sc *rx_sc; 2187 sci_t sci; 2188 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2189 int ret; 2190 2191 if (!attrs[MACSEC_ATTR_IFINDEX]) 2192 return -EINVAL; 2193 2194 if (parse_rxsc_config(attrs, tb_rxsc)) 2195 return -EINVAL; 2196 2197 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2198 return -EINVAL; 2199 2200 rtnl_lock(); 2201 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2202 if (IS_ERR(dev)) { 2203 rtnl_unlock(); 2204 return PTR_ERR(dev); 2205 } 2206 2207 secy = &macsec_priv(dev)->secy; 2208 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2209 2210 rx_sc = del_rx_sc(secy, sci); 2211 if (!rx_sc) { 2212 rtnl_unlock(); 2213 return -ENODEV; 2214 } 2215 2216 /* If h/w offloading is available, propagate to the device */ 2217 if (macsec_is_offloaded(netdev_priv(dev))) { 2218 const struct macsec_ops *ops; 2219 struct macsec_context ctx; 2220 2221 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2222 if (!ops) { 2223 ret = -EOPNOTSUPP; 2224 goto cleanup; 2225 } 2226 2227 ctx.rx_sc = rx_sc; 2228 ctx.secy = secy; 2229 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2230 if (ret) 2231 goto cleanup; 2232 } 2233 2234 free_rx_sc(rx_sc); 2235 rtnl_unlock(); 2236 2237 return 0; 2238 2239 cleanup: 2240 rtnl_unlock(); 2241 return ret; 2242 } 2243 2244 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2245 { 2246 struct nlattr **attrs = info->attrs; 2247 struct net_device *dev; 2248 struct macsec_secy *secy; 2249 struct macsec_tx_sc *tx_sc; 2250 struct macsec_tx_sa *tx_sa; 2251 u8 assoc_num; 2252 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2253 int ret; 2254 2255 if (!attrs[MACSEC_ATTR_IFINDEX]) 2256 return -EINVAL; 2257 2258 if (parse_sa_config(attrs, tb_sa)) 2259 return -EINVAL; 2260 2261 rtnl_lock(); 2262 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2263 &dev, &secy, &tx_sc, &assoc_num); 2264 if (IS_ERR(tx_sa)) { 2265 rtnl_unlock(); 2266 return PTR_ERR(tx_sa); 2267 } 2268 2269 if (tx_sa->active) { 2270 rtnl_unlock(); 2271 return -EBUSY; 2272 } 2273 2274 /* If h/w offloading is available, propagate to the device */ 2275 if (macsec_is_offloaded(netdev_priv(dev))) { 2276 const struct macsec_ops *ops; 2277 struct macsec_context ctx; 2278 2279 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2280 if (!ops) { 2281 ret = -EOPNOTSUPP; 2282 goto cleanup; 2283 } 2284 2285 ctx.sa.assoc_num = assoc_num; 2286 ctx.sa.tx_sa = tx_sa; 2287 ctx.secy = secy; 2288 2289 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2290 if (ret) 2291 goto cleanup; 2292 } 2293 2294 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2295 clear_tx_sa(tx_sa); 2296 2297 rtnl_unlock(); 2298 2299 return 0; 2300 2301 cleanup: 2302 rtnl_unlock(); 2303 return ret; 2304 } 2305 2306 static bool validate_upd_sa(struct nlattr **attrs) 2307 { 2308 if (!attrs[MACSEC_SA_ATTR_AN] || 2309 attrs[MACSEC_SA_ATTR_KEY] || 2310 attrs[MACSEC_SA_ATTR_KEYID] || 2311 attrs[MACSEC_SA_ATTR_SSCI] || 2312 attrs[MACSEC_SA_ATTR_SALT]) 2313 return false; 2314 2315 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2316 return false; 2317 2318 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2319 return false; 2320 2321 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2322 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2323 return false; 2324 } 2325 2326 return true; 2327 } 2328 2329 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2330 { 2331 struct nlattr **attrs = info->attrs; 2332 struct net_device *dev; 2333 struct macsec_secy *secy; 2334 struct macsec_tx_sc *tx_sc; 2335 struct macsec_tx_sa *tx_sa; 2336 u8 assoc_num; 2337 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2338 bool was_operational, was_active; 2339 pn_t prev_pn; 2340 int ret = 0; 2341 2342 prev_pn.full64 = 0; 2343 2344 if (!attrs[MACSEC_ATTR_IFINDEX]) 2345 return -EINVAL; 2346 2347 if (parse_sa_config(attrs, tb_sa)) 2348 return -EINVAL; 2349 2350 if (!validate_upd_sa(tb_sa)) 2351 return -EINVAL; 2352 2353 rtnl_lock(); 2354 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2355 &dev, &secy, &tx_sc, &assoc_num); 2356 if (IS_ERR(tx_sa)) { 2357 rtnl_unlock(); 2358 return PTR_ERR(tx_sa); 2359 } 2360 2361 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2362 int pn_len; 2363 2364 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2365 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2366 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2367 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2368 rtnl_unlock(); 2369 return -EINVAL; 2370 } 2371 2372 spin_lock_bh(&tx_sa->lock); 2373 prev_pn = tx_sa->next_pn_halves; 2374 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2375 spin_unlock_bh(&tx_sa->lock); 2376 } 2377 2378 was_active = tx_sa->active; 2379 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2380 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2381 2382 was_operational = secy->operational; 2383 if (assoc_num == tx_sc->encoding_sa) 2384 secy->operational = tx_sa->active; 2385 2386 /* If h/w offloading is available, propagate to the device */ 2387 if (macsec_is_offloaded(netdev_priv(dev))) { 2388 const struct macsec_ops *ops; 2389 struct macsec_context ctx; 2390 2391 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2392 if (!ops) { 2393 ret = -EOPNOTSUPP; 2394 goto cleanup; 2395 } 2396 2397 ctx.sa.assoc_num = assoc_num; 2398 ctx.sa.tx_sa = tx_sa; 2399 ctx.secy = secy; 2400 2401 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2402 if (ret) 2403 goto cleanup; 2404 } 2405 2406 rtnl_unlock(); 2407 2408 return 0; 2409 2410 cleanup: 2411 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2412 spin_lock_bh(&tx_sa->lock); 2413 tx_sa->next_pn_halves = prev_pn; 2414 spin_unlock_bh(&tx_sa->lock); 2415 } 2416 tx_sa->active = was_active; 2417 secy->operational = was_operational; 2418 rtnl_unlock(); 2419 return ret; 2420 } 2421 2422 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2423 { 2424 struct nlattr **attrs = info->attrs; 2425 struct net_device *dev; 2426 struct macsec_secy *secy; 2427 struct macsec_rx_sc *rx_sc; 2428 struct macsec_rx_sa *rx_sa; 2429 u8 assoc_num; 2430 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2431 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2432 bool was_active; 2433 pn_t prev_pn; 2434 int ret = 0; 2435 2436 prev_pn.full64 = 0; 2437 2438 if (!attrs[MACSEC_ATTR_IFINDEX]) 2439 return -EINVAL; 2440 2441 if (parse_rxsc_config(attrs, tb_rxsc)) 2442 return -EINVAL; 2443 2444 if (parse_sa_config(attrs, tb_sa)) 2445 return -EINVAL; 2446 2447 if (!validate_upd_sa(tb_sa)) 2448 return -EINVAL; 2449 2450 rtnl_lock(); 2451 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2452 &dev, &secy, &rx_sc, &assoc_num); 2453 if (IS_ERR(rx_sa)) { 2454 rtnl_unlock(); 2455 return PTR_ERR(rx_sa); 2456 } 2457 2458 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2459 int pn_len; 2460 2461 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2462 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2463 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2464 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2465 rtnl_unlock(); 2466 return -EINVAL; 2467 } 2468 2469 spin_lock_bh(&rx_sa->lock); 2470 prev_pn = rx_sa->next_pn_halves; 2471 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2472 spin_unlock_bh(&rx_sa->lock); 2473 } 2474 2475 was_active = rx_sa->active; 2476 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2477 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2478 2479 /* If h/w offloading is available, propagate to the device */ 2480 if (macsec_is_offloaded(netdev_priv(dev))) { 2481 const struct macsec_ops *ops; 2482 struct macsec_context ctx; 2483 2484 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2485 if (!ops) { 2486 ret = -EOPNOTSUPP; 2487 goto cleanup; 2488 } 2489 2490 ctx.sa.assoc_num = assoc_num; 2491 ctx.sa.rx_sa = rx_sa; 2492 ctx.secy = secy; 2493 2494 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2495 if (ret) 2496 goto cleanup; 2497 } 2498 2499 rtnl_unlock(); 2500 return 0; 2501 2502 cleanup: 2503 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2504 spin_lock_bh(&rx_sa->lock); 2505 rx_sa->next_pn_halves = prev_pn; 2506 spin_unlock_bh(&rx_sa->lock); 2507 } 2508 rx_sa->active = was_active; 2509 rtnl_unlock(); 2510 return ret; 2511 } 2512 2513 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2514 { 2515 struct nlattr **attrs = info->attrs; 2516 struct net_device *dev; 2517 struct macsec_secy *secy; 2518 struct macsec_rx_sc *rx_sc; 2519 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2520 unsigned int prev_n_rx_sc; 2521 bool was_active; 2522 int ret; 2523 2524 if (!attrs[MACSEC_ATTR_IFINDEX]) 2525 return -EINVAL; 2526 2527 if (parse_rxsc_config(attrs, tb_rxsc)) 2528 return -EINVAL; 2529 2530 if (!validate_add_rxsc(tb_rxsc)) 2531 return -EINVAL; 2532 2533 rtnl_lock(); 2534 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2535 if (IS_ERR(rx_sc)) { 2536 rtnl_unlock(); 2537 return PTR_ERR(rx_sc); 2538 } 2539 2540 was_active = rx_sc->active; 2541 prev_n_rx_sc = secy->n_rx_sc; 2542 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2543 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2544 2545 if (rx_sc->active != new) 2546 secy->n_rx_sc += new ? 1 : -1; 2547 2548 rx_sc->active = new; 2549 } 2550 2551 /* If h/w offloading is available, propagate to the device */ 2552 if (macsec_is_offloaded(netdev_priv(dev))) { 2553 const struct macsec_ops *ops; 2554 struct macsec_context ctx; 2555 2556 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2557 if (!ops) { 2558 ret = -EOPNOTSUPP; 2559 goto cleanup; 2560 } 2561 2562 ctx.rx_sc = rx_sc; 2563 ctx.secy = secy; 2564 2565 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2566 if (ret) 2567 goto cleanup; 2568 } 2569 2570 rtnl_unlock(); 2571 2572 return 0; 2573 2574 cleanup: 2575 secy->n_rx_sc = prev_n_rx_sc; 2576 rx_sc->active = was_active; 2577 rtnl_unlock(); 2578 return ret; 2579 } 2580 2581 static bool macsec_is_configured(struct macsec_dev *macsec) 2582 { 2583 struct macsec_secy *secy = &macsec->secy; 2584 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2585 int i; 2586 2587 if (secy->n_rx_sc > 0) 2588 return true; 2589 2590 for (i = 0; i < MACSEC_NUM_AN; i++) 2591 if (tx_sc->sa[i]) 2592 return true; 2593 2594 return false; 2595 } 2596 2597 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2598 { 2599 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2600 enum macsec_offload offload, prev_offload; 2601 int (*func)(struct macsec_context *ctx); 2602 struct nlattr **attrs = info->attrs; 2603 struct net_device *dev; 2604 const struct macsec_ops *ops; 2605 struct macsec_context ctx; 2606 struct macsec_dev *macsec; 2607 int ret; 2608 2609 if (!attrs[MACSEC_ATTR_IFINDEX]) 2610 return -EINVAL; 2611 2612 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2613 return -EINVAL; 2614 2615 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2616 attrs[MACSEC_ATTR_OFFLOAD], 2617 macsec_genl_offload_policy, NULL)) 2618 return -EINVAL; 2619 2620 dev = get_dev_from_nl(genl_info_net(info), attrs); 2621 if (IS_ERR(dev)) 2622 return PTR_ERR(dev); 2623 macsec = macsec_priv(dev); 2624 2625 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2626 return -EINVAL; 2627 2628 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2629 if (macsec->offload == offload) 2630 return 0; 2631 2632 /* Check if the offloading mode is supported by the underlying layers */ 2633 if (offload != MACSEC_OFFLOAD_OFF && 2634 !macsec_check_offload(offload, macsec)) 2635 return -EOPNOTSUPP; 2636 2637 /* Check if the net device is busy. */ 2638 if (netif_running(dev)) 2639 return -EBUSY; 2640 2641 rtnl_lock(); 2642 2643 prev_offload = macsec->offload; 2644 macsec->offload = offload; 2645 2646 /* Check if the device already has rules configured: we do not support 2647 * rules migration. 2648 */ 2649 if (macsec_is_configured(macsec)) { 2650 ret = -EBUSY; 2651 goto rollback; 2652 } 2653 2654 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2655 macsec, &ctx); 2656 if (!ops) { 2657 ret = -EOPNOTSUPP; 2658 goto rollback; 2659 } 2660 2661 if (prev_offload == MACSEC_OFFLOAD_OFF) 2662 func = ops->mdo_add_secy; 2663 else 2664 func = ops->mdo_del_secy; 2665 2666 ctx.secy = &macsec->secy; 2667 ret = macsec_offload(func, &ctx); 2668 if (ret) 2669 goto rollback; 2670 2671 /* Force features update, since they are different for SW MACSec and 2672 * HW offloading cases. 2673 */ 2674 netdev_update_features(dev); 2675 2676 rtnl_unlock(); 2677 return 0; 2678 2679 rollback: 2680 macsec->offload = prev_offload; 2681 2682 rtnl_unlock(); 2683 return ret; 2684 } 2685 2686 static void get_tx_sa_stats(struct net_device *dev, int an, 2687 struct macsec_tx_sa *tx_sa, 2688 struct macsec_tx_sa_stats *sum) 2689 { 2690 struct macsec_dev *macsec = macsec_priv(dev); 2691 int cpu; 2692 2693 /* If h/w offloading is available, propagate to the device */ 2694 if (macsec_is_offloaded(macsec)) { 2695 const struct macsec_ops *ops; 2696 struct macsec_context ctx; 2697 2698 ops = macsec_get_ops(macsec, &ctx); 2699 if (ops) { 2700 ctx.sa.assoc_num = an; 2701 ctx.sa.tx_sa = tx_sa; 2702 ctx.stats.tx_sa_stats = sum; 2703 ctx.secy = &macsec_priv(dev)->secy; 2704 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2705 } 2706 return; 2707 } 2708 2709 for_each_possible_cpu(cpu) { 2710 const struct macsec_tx_sa_stats *stats = 2711 per_cpu_ptr(tx_sa->stats, cpu); 2712 2713 sum->OutPktsProtected += stats->OutPktsProtected; 2714 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2715 } 2716 } 2717 2718 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2719 { 2720 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2721 sum->OutPktsProtected) || 2722 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2723 sum->OutPktsEncrypted)) 2724 return -EMSGSIZE; 2725 2726 return 0; 2727 } 2728 2729 static void get_rx_sa_stats(struct net_device *dev, 2730 struct macsec_rx_sc *rx_sc, int an, 2731 struct macsec_rx_sa *rx_sa, 2732 struct macsec_rx_sa_stats *sum) 2733 { 2734 struct macsec_dev *macsec = macsec_priv(dev); 2735 int cpu; 2736 2737 /* If h/w offloading is available, propagate to the device */ 2738 if (macsec_is_offloaded(macsec)) { 2739 const struct macsec_ops *ops; 2740 struct macsec_context ctx; 2741 2742 ops = macsec_get_ops(macsec, &ctx); 2743 if (ops) { 2744 ctx.sa.assoc_num = an; 2745 ctx.sa.rx_sa = rx_sa; 2746 ctx.stats.rx_sa_stats = sum; 2747 ctx.secy = &macsec_priv(dev)->secy; 2748 ctx.rx_sc = rx_sc; 2749 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2750 } 2751 return; 2752 } 2753 2754 for_each_possible_cpu(cpu) { 2755 const struct macsec_rx_sa_stats *stats = 2756 per_cpu_ptr(rx_sa->stats, cpu); 2757 2758 sum->InPktsOK += stats->InPktsOK; 2759 sum->InPktsInvalid += stats->InPktsInvalid; 2760 sum->InPktsNotValid += stats->InPktsNotValid; 2761 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2762 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2763 } 2764 } 2765 2766 static int copy_rx_sa_stats(struct sk_buff *skb, 2767 struct macsec_rx_sa_stats *sum) 2768 { 2769 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2770 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2771 sum->InPktsInvalid) || 2772 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2773 sum->InPktsNotValid) || 2774 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2775 sum->InPktsNotUsingSA) || 2776 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2777 sum->InPktsUnusedSA)) 2778 return -EMSGSIZE; 2779 2780 return 0; 2781 } 2782 2783 static void get_rx_sc_stats(struct net_device *dev, 2784 struct macsec_rx_sc *rx_sc, 2785 struct macsec_rx_sc_stats *sum) 2786 { 2787 struct macsec_dev *macsec = macsec_priv(dev); 2788 int cpu; 2789 2790 /* If h/w offloading is available, propagate to the device */ 2791 if (macsec_is_offloaded(macsec)) { 2792 const struct macsec_ops *ops; 2793 struct macsec_context ctx; 2794 2795 ops = macsec_get_ops(macsec, &ctx); 2796 if (ops) { 2797 ctx.stats.rx_sc_stats = sum; 2798 ctx.secy = &macsec_priv(dev)->secy; 2799 ctx.rx_sc = rx_sc; 2800 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2801 } 2802 return; 2803 } 2804 2805 for_each_possible_cpu(cpu) { 2806 const struct pcpu_rx_sc_stats *stats; 2807 struct macsec_rx_sc_stats tmp; 2808 unsigned int start; 2809 2810 stats = per_cpu_ptr(rx_sc->stats, cpu); 2811 do { 2812 start = u64_stats_fetch_begin_irq(&stats->syncp); 2813 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2814 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2815 2816 sum->InOctetsValidated += tmp.InOctetsValidated; 2817 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2818 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2819 sum->InPktsDelayed += tmp.InPktsDelayed; 2820 sum->InPktsOK += tmp.InPktsOK; 2821 sum->InPktsInvalid += tmp.InPktsInvalid; 2822 sum->InPktsLate += tmp.InPktsLate; 2823 sum->InPktsNotValid += tmp.InPktsNotValid; 2824 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2825 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2826 } 2827 } 2828 2829 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2830 { 2831 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2832 sum->InOctetsValidated, 2833 MACSEC_RXSC_STATS_ATTR_PAD) || 2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2835 sum->InOctetsDecrypted, 2836 MACSEC_RXSC_STATS_ATTR_PAD) || 2837 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2838 sum->InPktsUnchecked, 2839 MACSEC_RXSC_STATS_ATTR_PAD) || 2840 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2841 sum->InPktsDelayed, 2842 MACSEC_RXSC_STATS_ATTR_PAD) || 2843 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2844 sum->InPktsOK, 2845 MACSEC_RXSC_STATS_ATTR_PAD) || 2846 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2847 sum->InPktsInvalid, 2848 MACSEC_RXSC_STATS_ATTR_PAD) || 2849 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2850 sum->InPktsLate, 2851 MACSEC_RXSC_STATS_ATTR_PAD) || 2852 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2853 sum->InPktsNotValid, 2854 MACSEC_RXSC_STATS_ATTR_PAD) || 2855 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2856 sum->InPktsNotUsingSA, 2857 MACSEC_RXSC_STATS_ATTR_PAD) || 2858 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2859 sum->InPktsUnusedSA, 2860 MACSEC_RXSC_STATS_ATTR_PAD)) 2861 return -EMSGSIZE; 2862 2863 return 0; 2864 } 2865 2866 static void get_tx_sc_stats(struct net_device *dev, 2867 struct macsec_tx_sc_stats *sum) 2868 { 2869 struct macsec_dev *macsec = macsec_priv(dev); 2870 int cpu; 2871 2872 /* If h/w offloading is available, propagate to the device */ 2873 if (macsec_is_offloaded(macsec)) { 2874 const struct macsec_ops *ops; 2875 struct macsec_context ctx; 2876 2877 ops = macsec_get_ops(macsec, &ctx); 2878 if (ops) { 2879 ctx.stats.tx_sc_stats = sum; 2880 ctx.secy = &macsec_priv(dev)->secy; 2881 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2882 } 2883 return; 2884 } 2885 2886 for_each_possible_cpu(cpu) { 2887 const struct pcpu_tx_sc_stats *stats; 2888 struct macsec_tx_sc_stats tmp; 2889 unsigned int start; 2890 2891 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2892 do { 2893 start = u64_stats_fetch_begin_irq(&stats->syncp); 2894 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2895 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2896 2897 sum->OutPktsProtected += tmp.OutPktsProtected; 2898 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2899 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2900 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2901 } 2902 } 2903 2904 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2905 { 2906 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2907 sum->OutPktsProtected, 2908 MACSEC_TXSC_STATS_ATTR_PAD) || 2909 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2910 sum->OutPktsEncrypted, 2911 MACSEC_TXSC_STATS_ATTR_PAD) || 2912 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2913 sum->OutOctetsProtected, 2914 MACSEC_TXSC_STATS_ATTR_PAD) || 2915 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2916 sum->OutOctetsEncrypted, 2917 MACSEC_TXSC_STATS_ATTR_PAD)) 2918 return -EMSGSIZE; 2919 2920 return 0; 2921 } 2922 2923 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2924 { 2925 struct macsec_dev *macsec = macsec_priv(dev); 2926 int cpu; 2927 2928 /* If h/w offloading is available, propagate to the device */ 2929 if (macsec_is_offloaded(macsec)) { 2930 const struct macsec_ops *ops; 2931 struct macsec_context ctx; 2932 2933 ops = macsec_get_ops(macsec, &ctx); 2934 if (ops) { 2935 ctx.stats.dev_stats = sum; 2936 ctx.secy = &macsec_priv(dev)->secy; 2937 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2938 } 2939 return; 2940 } 2941 2942 for_each_possible_cpu(cpu) { 2943 const struct pcpu_secy_stats *stats; 2944 struct macsec_dev_stats tmp; 2945 unsigned int start; 2946 2947 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2948 do { 2949 start = u64_stats_fetch_begin_irq(&stats->syncp); 2950 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2951 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2952 2953 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2954 sum->InPktsUntagged += tmp.InPktsUntagged; 2955 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2956 sum->InPktsNoTag += tmp.InPktsNoTag; 2957 sum->InPktsBadTag += tmp.InPktsBadTag; 2958 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2959 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2960 sum->InPktsOverrun += tmp.InPktsOverrun; 2961 } 2962 } 2963 2964 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2965 { 2966 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2967 sum->OutPktsUntagged, 2968 MACSEC_SECY_STATS_ATTR_PAD) || 2969 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2970 sum->InPktsUntagged, 2971 MACSEC_SECY_STATS_ATTR_PAD) || 2972 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2973 sum->OutPktsTooLong, 2974 MACSEC_SECY_STATS_ATTR_PAD) || 2975 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2976 sum->InPktsNoTag, 2977 MACSEC_SECY_STATS_ATTR_PAD) || 2978 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2979 sum->InPktsBadTag, 2980 MACSEC_SECY_STATS_ATTR_PAD) || 2981 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2982 sum->InPktsUnknownSCI, 2983 MACSEC_SECY_STATS_ATTR_PAD) || 2984 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2985 sum->InPktsNoSCI, 2986 MACSEC_SECY_STATS_ATTR_PAD) || 2987 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2988 sum->InPktsOverrun, 2989 MACSEC_SECY_STATS_ATTR_PAD)) 2990 return -EMSGSIZE; 2991 2992 return 0; 2993 } 2994 2995 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2996 { 2997 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2998 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2999 MACSEC_ATTR_SECY); 3000 u64 csid; 3001 3002 if (!secy_nest) 3003 return 1; 3004 3005 switch (secy->key_len) { 3006 case MACSEC_GCM_AES_128_SAK_LEN: 3007 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3008 break; 3009 case MACSEC_GCM_AES_256_SAK_LEN: 3010 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3011 break; 3012 default: 3013 goto cancel; 3014 } 3015 3016 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3017 MACSEC_SECY_ATTR_PAD) || 3018 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3019 csid, MACSEC_SECY_ATTR_PAD) || 3020 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3021 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3022 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3023 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3024 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3025 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3026 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3027 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3028 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3029 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3030 goto cancel; 3031 3032 if (secy->replay_protect) { 3033 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3034 goto cancel; 3035 } 3036 3037 nla_nest_end(skb, secy_nest); 3038 return 0; 3039 3040 cancel: 3041 nla_nest_cancel(skb, secy_nest); 3042 return 1; 3043 } 3044 3045 static noinline_for_stack int 3046 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3047 struct sk_buff *skb, struct netlink_callback *cb) 3048 { 3049 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3050 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3051 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3052 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3053 struct macsec_dev *macsec = netdev_priv(dev); 3054 struct macsec_dev_stats dev_stats = {0, }; 3055 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3056 struct nlattr *txsa_list, *rxsc_list; 3057 struct macsec_rx_sc *rx_sc; 3058 struct nlattr *attr; 3059 void *hdr; 3060 int i, j; 3061 3062 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3063 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3064 if (!hdr) 3065 return -EMSGSIZE; 3066 3067 genl_dump_check_consistent(cb, hdr); 3068 3069 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3070 goto nla_put_failure; 3071 3072 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3073 if (!attr) 3074 goto nla_put_failure; 3075 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3076 goto nla_put_failure; 3077 nla_nest_end(skb, attr); 3078 3079 if (nla_put_secy(secy, skb)) 3080 goto nla_put_failure; 3081 3082 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3083 if (!attr) 3084 goto nla_put_failure; 3085 3086 get_tx_sc_stats(dev, &tx_sc_stats); 3087 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3088 nla_nest_cancel(skb, attr); 3089 goto nla_put_failure; 3090 } 3091 nla_nest_end(skb, attr); 3092 3093 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3094 if (!attr) 3095 goto nla_put_failure; 3096 get_secy_stats(dev, &dev_stats); 3097 if (copy_secy_stats(skb, &dev_stats)) { 3098 nla_nest_cancel(skb, attr); 3099 goto nla_put_failure; 3100 } 3101 nla_nest_end(skb, attr); 3102 3103 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3104 if (!txsa_list) 3105 goto nla_put_failure; 3106 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3107 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3108 struct nlattr *txsa_nest; 3109 u64 pn; 3110 int pn_len; 3111 3112 if (!tx_sa) 3113 continue; 3114 3115 txsa_nest = nla_nest_start_noflag(skb, j++); 3116 if (!txsa_nest) { 3117 nla_nest_cancel(skb, txsa_list); 3118 goto nla_put_failure; 3119 } 3120 3121 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3122 if (!attr) { 3123 nla_nest_cancel(skb, txsa_nest); 3124 nla_nest_cancel(skb, txsa_list); 3125 goto nla_put_failure; 3126 } 3127 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3128 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3129 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3130 nla_nest_cancel(skb, attr); 3131 nla_nest_cancel(skb, txsa_nest); 3132 nla_nest_cancel(skb, txsa_list); 3133 goto nla_put_failure; 3134 } 3135 nla_nest_end(skb, attr); 3136 3137 if (secy->xpn) { 3138 pn = tx_sa->next_pn; 3139 pn_len = MACSEC_XPN_PN_LEN; 3140 } else { 3141 pn = tx_sa->next_pn_halves.lower; 3142 pn_len = MACSEC_DEFAULT_PN_LEN; 3143 } 3144 3145 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3146 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3147 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3148 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3149 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3150 nla_nest_cancel(skb, txsa_nest); 3151 nla_nest_cancel(skb, txsa_list); 3152 goto nla_put_failure; 3153 } 3154 3155 nla_nest_end(skb, txsa_nest); 3156 } 3157 nla_nest_end(skb, txsa_list); 3158 3159 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3160 if (!rxsc_list) 3161 goto nla_put_failure; 3162 3163 j = 1; 3164 for_each_rxsc_rtnl(secy, rx_sc) { 3165 int k; 3166 struct nlattr *rxsa_list; 3167 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3168 3169 if (!rxsc_nest) { 3170 nla_nest_cancel(skb, rxsc_list); 3171 goto nla_put_failure; 3172 } 3173 3174 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3175 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3176 MACSEC_RXSC_ATTR_PAD)) { 3177 nla_nest_cancel(skb, rxsc_nest); 3178 nla_nest_cancel(skb, rxsc_list); 3179 goto nla_put_failure; 3180 } 3181 3182 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3183 if (!attr) { 3184 nla_nest_cancel(skb, rxsc_nest); 3185 nla_nest_cancel(skb, rxsc_list); 3186 goto nla_put_failure; 3187 } 3188 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3189 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3190 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3191 nla_nest_cancel(skb, attr); 3192 nla_nest_cancel(skb, rxsc_nest); 3193 nla_nest_cancel(skb, rxsc_list); 3194 goto nla_put_failure; 3195 } 3196 nla_nest_end(skb, attr); 3197 3198 rxsa_list = nla_nest_start_noflag(skb, 3199 MACSEC_RXSC_ATTR_SA_LIST); 3200 if (!rxsa_list) { 3201 nla_nest_cancel(skb, rxsc_nest); 3202 nla_nest_cancel(skb, rxsc_list); 3203 goto nla_put_failure; 3204 } 3205 3206 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3207 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3208 struct nlattr *rxsa_nest; 3209 u64 pn; 3210 int pn_len; 3211 3212 if (!rx_sa) 3213 continue; 3214 3215 rxsa_nest = nla_nest_start_noflag(skb, k++); 3216 if (!rxsa_nest) { 3217 nla_nest_cancel(skb, rxsa_list); 3218 nla_nest_cancel(skb, rxsc_nest); 3219 nla_nest_cancel(skb, rxsc_list); 3220 goto nla_put_failure; 3221 } 3222 3223 attr = nla_nest_start_noflag(skb, 3224 MACSEC_SA_ATTR_STATS); 3225 if (!attr) { 3226 nla_nest_cancel(skb, rxsa_list); 3227 nla_nest_cancel(skb, rxsc_nest); 3228 nla_nest_cancel(skb, rxsc_list); 3229 goto nla_put_failure; 3230 } 3231 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3232 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3233 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3234 nla_nest_cancel(skb, attr); 3235 nla_nest_cancel(skb, rxsa_list); 3236 nla_nest_cancel(skb, rxsc_nest); 3237 nla_nest_cancel(skb, rxsc_list); 3238 goto nla_put_failure; 3239 } 3240 nla_nest_end(skb, attr); 3241 3242 if (secy->xpn) { 3243 pn = rx_sa->next_pn; 3244 pn_len = MACSEC_XPN_PN_LEN; 3245 } else { 3246 pn = rx_sa->next_pn_halves.lower; 3247 pn_len = MACSEC_DEFAULT_PN_LEN; 3248 } 3249 3250 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3251 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3252 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3253 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3254 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3255 nla_nest_cancel(skb, rxsa_nest); 3256 nla_nest_cancel(skb, rxsc_nest); 3257 nla_nest_cancel(skb, rxsc_list); 3258 goto nla_put_failure; 3259 } 3260 nla_nest_end(skb, rxsa_nest); 3261 } 3262 3263 nla_nest_end(skb, rxsa_list); 3264 nla_nest_end(skb, rxsc_nest); 3265 } 3266 3267 nla_nest_end(skb, rxsc_list); 3268 3269 genlmsg_end(skb, hdr); 3270 3271 return 0; 3272 3273 nla_put_failure: 3274 genlmsg_cancel(skb, hdr); 3275 return -EMSGSIZE; 3276 } 3277 3278 static int macsec_generation = 1; /* protected by RTNL */ 3279 3280 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3281 { 3282 struct net *net = sock_net(skb->sk); 3283 struct net_device *dev; 3284 int dev_idx, d; 3285 3286 dev_idx = cb->args[0]; 3287 3288 d = 0; 3289 rtnl_lock(); 3290 3291 cb->seq = macsec_generation; 3292 3293 for_each_netdev(net, dev) { 3294 struct macsec_secy *secy; 3295 3296 if (d < dev_idx) 3297 goto next; 3298 3299 if (!netif_is_macsec(dev)) 3300 goto next; 3301 3302 secy = &macsec_priv(dev)->secy; 3303 if (dump_secy(secy, dev, skb, cb) < 0) 3304 goto done; 3305 next: 3306 d++; 3307 } 3308 3309 done: 3310 rtnl_unlock(); 3311 cb->args[0] = d; 3312 return skb->len; 3313 } 3314 3315 static const struct genl_small_ops macsec_genl_ops[] = { 3316 { 3317 .cmd = MACSEC_CMD_GET_TXSC, 3318 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3319 .dumpit = macsec_dump_txsc, 3320 }, 3321 { 3322 .cmd = MACSEC_CMD_ADD_RXSC, 3323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3324 .doit = macsec_add_rxsc, 3325 .flags = GENL_ADMIN_PERM, 3326 }, 3327 { 3328 .cmd = MACSEC_CMD_DEL_RXSC, 3329 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3330 .doit = macsec_del_rxsc, 3331 .flags = GENL_ADMIN_PERM, 3332 }, 3333 { 3334 .cmd = MACSEC_CMD_UPD_RXSC, 3335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3336 .doit = macsec_upd_rxsc, 3337 .flags = GENL_ADMIN_PERM, 3338 }, 3339 { 3340 .cmd = MACSEC_CMD_ADD_TXSA, 3341 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3342 .doit = macsec_add_txsa, 3343 .flags = GENL_ADMIN_PERM, 3344 }, 3345 { 3346 .cmd = MACSEC_CMD_DEL_TXSA, 3347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3348 .doit = macsec_del_txsa, 3349 .flags = GENL_ADMIN_PERM, 3350 }, 3351 { 3352 .cmd = MACSEC_CMD_UPD_TXSA, 3353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3354 .doit = macsec_upd_txsa, 3355 .flags = GENL_ADMIN_PERM, 3356 }, 3357 { 3358 .cmd = MACSEC_CMD_ADD_RXSA, 3359 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3360 .doit = macsec_add_rxsa, 3361 .flags = GENL_ADMIN_PERM, 3362 }, 3363 { 3364 .cmd = MACSEC_CMD_DEL_RXSA, 3365 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3366 .doit = macsec_del_rxsa, 3367 .flags = GENL_ADMIN_PERM, 3368 }, 3369 { 3370 .cmd = MACSEC_CMD_UPD_RXSA, 3371 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3372 .doit = macsec_upd_rxsa, 3373 .flags = GENL_ADMIN_PERM, 3374 }, 3375 { 3376 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3377 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3378 .doit = macsec_upd_offload, 3379 .flags = GENL_ADMIN_PERM, 3380 }, 3381 }; 3382 3383 static struct genl_family macsec_fam __ro_after_init = { 3384 .name = MACSEC_GENL_NAME, 3385 .hdrsize = 0, 3386 .version = MACSEC_GENL_VERSION, 3387 .maxattr = MACSEC_ATTR_MAX, 3388 .policy = macsec_genl_policy, 3389 .netnsok = true, 3390 .module = THIS_MODULE, 3391 .small_ops = macsec_genl_ops, 3392 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3393 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3394 }; 3395 3396 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3397 struct net_device *dev) 3398 { 3399 struct macsec_dev *macsec = netdev_priv(dev); 3400 struct macsec_secy *secy = &macsec->secy; 3401 struct pcpu_secy_stats *secy_stats; 3402 int ret, len; 3403 3404 if (macsec_is_offloaded(netdev_priv(dev))) { 3405 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3406 3407 skb_dst_drop(skb); 3408 dst_hold(&md_dst->dst); 3409 skb_dst_set(skb, &md_dst->dst); 3410 skb->dev = macsec->real_dev; 3411 return dev_queue_xmit(skb); 3412 } 3413 3414 /* 10.5 */ 3415 if (!secy->protect_frames) { 3416 secy_stats = this_cpu_ptr(macsec->stats); 3417 u64_stats_update_begin(&secy_stats->syncp); 3418 secy_stats->stats.OutPktsUntagged++; 3419 u64_stats_update_end(&secy_stats->syncp); 3420 skb->dev = macsec->real_dev; 3421 len = skb->len; 3422 ret = dev_queue_xmit(skb); 3423 count_tx(dev, ret, len); 3424 return ret; 3425 } 3426 3427 if (!secy->operational) { 3428 kfree_skb(skb); 3429 dev->stats.tx_dropped++; 3430 return NETDEV_TX_OK; 3431 } 3432 3433 len = skb->len; 3434 skb = macsec_encrypt(skb, dev); 3435 if (IS_ERR(skb)) { 3436 if (PTR_ERR(skb) != -EINPROGRESS) 3437 dev->stats.tx_dropped++; 3438 return NETDEV_TX_OK; 3439 } 3440 3441 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3442 3443 macsec_encrypt_finish(skb, dev); 3444 ret = dev_queue_xmit(skb); 3445 count_tx(dev, ret, len); 3446 return ret; 3447 } 3448 3449 #define SW_MACSEC_FEATURES \ 3450 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3451 3452 /* If h/w offloading is enabled, use real device features save for 3453 * VLAN_FEATURES - they require additional ops 3454 * HW_MACSEC - no reason to report it 3455 */ 3456 #define REAL_DEV_FEATURES(dev) \ 3457 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) 3458 3459 static int macsec_dev_init(struct net_device *dev) 3460 { 3461 struct macsec_dev *macsec = macsec_priv(dev); 3462 struct net_device *real_dev = macsec->real_dev; 3463 int err; 3464 3465 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3466 if (!dev->tstats) 3467 return -ENOMEM; 3468 3469 err = gro_cells_init(&macsec->gro_cells, dev); 3470 if (err) { 3471 free_percpu(dev->tstats); 3472 return err; 3473 } 3474 3475 if (macsec_is_offloaded(macsec)) { 3476 dev->features = REAL_DEV_FEATURES(real_dev); 3477 } else { 3478 dev->features = real_dev->features & SW_MACSEC_FEATURES; 3479 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3480 } 3481 3482 dev->needed_headroom = real_dev->needed_headroom + 3483 MACSEC_NEEDED_HEADROOM; 3484 dev->needed_tailroom = real_dev->needed_tailroom + 3485 MACSEC_NEEDED_TAILROOM; 3486 3487 if (is_zero_ether_addr(dev->dev_addr)) 3488 eth_hw_addr_inherit(dev, real_dev); 3489 if (is_zero_ether_addr(dev->broadcast)) 3490 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3491 3492 /* Get macsec's reference to real_dev */ 3493 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3494 3495 return 0; 3496 } 3497 3498 static void macsec_dev_uninit(struct net_device *dev) 3499 { 3500 struct macsec_dev *macsec = macsec_priv(dev); 3501 3502 gro_cells_destroy(&macsec->gro_cells); 3503 free_percpu(dev->tstats); 3504 } 3505 3506 static netdev_features_t macsec_fix_features(struct net_device *dev, 3507 netdev_features_t features) 3508 { 3509 struct macsec_dev *macsec = macsec_priv(dev); 3510 struct net_device *real_dev = macsec->real_dev; 3511 3512 if (macsec_is_offloaded(macsec)) 3513 return REAL_DEV_FEATURES(real_dev); 3514 3515 features &= (real_dev->features & SW_MACSEC_FEATURES) | 3516 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3517 features |= NETIF_F_LLTX; 3518 3519 return features; 3520 } 3521 3522 static int macsec_dev_open(struct net_device *dev) 3523 { 3524 struct macsec_dev *macsec = macsec_priv(dev); 3525 struct net_device *real_dev = macsec->real_dev; 3526 int err; 3527 3528 err = dev_uc_add(real_dev, dev->dev_addr); 3529 if (err < 0) 3530 return err; 3531 3532 if (dev->flags & IFF_ALLMULTI) { 3533 err = dev_set_allmulti(real_dev, 1); 3534 if (err < 0) 3535 goto del_unicast; 3536 } 3537 3538 if (dev->flags & IFF_PROMISC) { 3539 err = dev_set_promiscuity(real_dev, 1); 3540 if (err < 0) 3541 goto clear_allmulti; 3542 } 3543 3544 /* If h/w offloading is available, propagate to the device */ 3545 if (macsec_is_offloaded(macsec)) { 3546 const struct macsec_ops *ops; 3547 struct macsec_context ctx; 3548 3549 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3550 if (!ops) { 3551 err = -EOPNOTSUPP; 3552 goto clear_allmulti; 3553 } 3554 3555 ctx.secy = &macsec->secy; 3556 err = macsec_offload(ops->mdo_dev_open, &ctx); 3557 if (err) 3558 goto clear_allmulti; 3559 } 3560 3561 if (netif_carrier_ok(real_dev)) 3562 netif_carrier_on(dev); 3563 3564 return 0; 3565 clear_allmulti: 3566 if (dev->flags & IFF_ALLMULTI) 3567 dev_set_allmulti(real_dev, -1); 3568 del_unicast: 3569 dev_uc_del(real_dev, dev->dev_addr); 3570 netif_carrier_off(dev); 3571 return err; 3572 } 3573 3574 static int macsec_dev_stop(struct net_device *dev) 3575 { 3576 struct macsec_dev *macsec = macsec_priv(dev); 3577 struct net_device *real_dev = macsec->real_dev; 3578 3579 netif_carrier_off(dev); 3580 3581 /* If h/w offloading is available, propagate to the device */ 3582 if (macsec_is_offloaded(macsec)) { 3583 const struct macsec_ops *ops; 3584 struct macsec_context ctx; 3585 3586 ops = macsec_get_ops(macsec, &ctx); 3587 if (ops) { 3588 ctx.secy = &macsec->secy; 3589 macsec_offload(ops->mdo_dev_stop, &ctx); 3590 } 3591 } 3592 3593 dev_mc_unsync(real_dev, dev); 3594 dev_uc_unsync(real_dev, dev); 3595 3596 if (dev->flags & IFF_ALLMULTI) 3597 dev_set_allmulti(real_dev, -1); 3598 3599 if (dev->flags & IFF_PROMISC) 3600 dev_set_promiscuity(real_dev, -1); 3601 3602 dev_uc_del(real_dev, dev->dev_addr); 3603 3604 return 0; 3605 } 3606 3607 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3608 { 3609 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3610 3611 if (!(dev->flags & IFF_UP)) 3612 return; 3613 3614 if (change & IFF_ALLMULTI) 3615 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3616 3617 if (change & IFF_PROMISC) 3618 dev_set_promiscuity(real_dev, 3619 dev->flags & IFF_PROMISC ? 1 : -1); 3620 } 3621 3622 static void macsec_dev_set_rx_mode(struct net_device *dev) 3623 { 3624 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3625 3626 dev_mc_sync(real_dev, dev); 3627 dev_uc_sync(real_dev, dev); 3628 } 3629 3630 static int macsec_set_mac_address(struct net_device *dev, void *p) 3631 { 3632 struct macsec_dev *macsec = macsec_priv(dev); 3633 struct net_device *real_dev = macsec->real_dev; 3634 struct sockaddr *addr = p; 3635 int err; 3636 3637 if (!is_valid_ether_addr(addr->sa_data)) 3638 return -EADDRNOTAVAIL; 3639 3640 if (!(dev->flags & IFF_UP)) 3641 goto out; 3642 3643 err = dev_uc_add(real_dev, addr->sa_data); 3644 if (err < 0) 3645 return err; 3646 3647 dev_uc_del(real_dev, dev->dev_addr); 3648 3649 out: 3650 eth_hw_addr_set(dev, addr->sa_data); 3651 3652 /* If h/w offloading is available, propagate to the device */ 3653 if (macsec_is_offloaded(macsec)) { 3654 const struct macsec_ops *ops; 3655 struct macsec_context ctx; 3656 3657 ops = macsec_get_ops(macsec, &ctx); 3658 if (ops) { 3659 ctx.secy = &macsec->secy; 3660 macsec_offload(ops->mdo_upd_secy, &ctx); 3661 } 3662 } 3663 3664 return 0; 3665 } 3666 3667 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3668 { 3669 struct macsec_dev *macsec = macsec_priv(dev); 3670 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3671 3672 if (macsec->real_dev->mtu - extra < new_mtu) 3673 return -ERANGE; 3674 3675 dev->mtu = new_mtu; 3676 3677 return 0; 3678 } 3679 3680 static void macsec_get_stats64(struct net_device *dev, 3681 struct rtnl_link_stats64 *s) 3682 { 3683 if (!dev->tstats) 3684 return; 3685 3686 dev_fetch_sw_netstats(s, dev->tstats); 3687 3688 s->rx_dropped = dev->stats.rx_dropped; 3689 s->tx_dropped = dev->stats.tx_dropped; 3690 s->rx_errors = dev->stats.rx_errors; 3691 } 3692 3693 static int macsec_get_iflink(const struct net_device *dev) 3694 { 3695 return macsec_priv(dev)->real_dev->ifindex; 3696 } 3697 3698 static const struct net_device_ops macsec_netdev_ops = { 3699 .ndo_init = macsec_dev_init, 3700 .ndo_uninit = macsec_dev_uninit, 3701 .ndo_open = macsec_dev_open, 3702 .ndo_stop = macsec_dev_stop, 3703 .ndo_fix_features = macsec_fix_features, 3704 .ndo_change_mtu = macsec_change_mtu, 3705 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3706 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3707 .ndo_set_mac_address = macsec_set_mac_address, 3708 .ndo_start_xmit = macsec_start_xmit, 3709 .ndo_get_stats64 = macsec_get_stats64, 3710 .ndo_get_iflink = macsec_get_iflink, 3711 }; 3712 3713 static const struct device_type macsec_type = { 3714 .name = "macsec", 3715 }; 3716 3717 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3718 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3719 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3720 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3721 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3722 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3723 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3724 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3725 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3726 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3727 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3728 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3729 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3730 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3731 }; 3732 3733 static void macsec_free_netdev(struct net_device *dev) 3734 { 3735 struct macsec_dev *macsec = macsec_priv(dev); 3736 3737 metadata_dst_free(macsec->secy.tx_sc.md_dst); 3738 free_percpu(macsec->stats); 3739 free_percpu(macsec->secy.tx_sc.stats); 3740 3741 /* Get rid of the macsec's reference to real_dev */ 3742 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3743 } 3744 3745 static void macsec_setup(struct net_device *dev) 3746 { 3747 ether_setup(dev); 3748 dev->min_mtu = 0; 3749 dev->max_mtu = ETH_MAX_MTU; 3750 dev->priv_flags |= IFF_NO_QUEUE; 3751 dev->netdev_ops = &macsec_netdev_ops; 3752 dev->needs_free_netdev = true; 3753 dev->priv_destructor = macsec_free_netdev; 3754 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3755 3756 eth_zero_addr(dev->broadcast); 3757 } 3758 3759 static int macsec_changelink_common(struct net_device *dev, 3760 struct nlattr *data[]) 3761 { 3762 struct macsec_secy *secy; 3763 struct macsec_tx_sc *tx_sc; 3764 3765 secy = &macsec_priv(dev)->secy; 3766 tx_sc = &secy->tx_sc; 3767 3768 if (data[IFLA_MACSEC_ENCODING_SA]) { 3769 struct macsec_tx_sa *tx_sa; 3770 3771 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3772 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3773 3774 secy->operational = tx_sa && tx_sa->active; 3775 } 3776 3777 if (data[IFLA_MACSEC_ENCRYPT]) 3778 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3779 3780 if (data[IFLA_MACSEC_PROTECT]) 3781 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3782 3783 if (data[IFLA_MACSEC_INC_SCI]) 3784 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3785 3786 if (data[IFLA_MACSEC_ES]) 3787 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3788 3789 if (data[IFLA_MACSEC_SCB]) 3790 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3791 3792 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3793 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3794 3795 if (data[IFLA_MACSEC_VALIDATION]) 3796 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3797 3798 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3799 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3800 case MACSEC_CIPHER_ID_GCM_AES_128: 3801 case MACSEC_DEFAULT_CIPHER_ID: 3802 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3803 secy->xpn = false; 3804 break; 3805 case MACSEC_CIPHER_ID_GCM_AES_256: 3806 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3807 secy->xpn = false; 3808 break; 3809 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3810 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3811 secy->xpn = true; 3812 break; 3813 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3814 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3815 secy->xpn = true; 3816 break; 3817 default: 3818 return -EINVAL; 3819 } 3820 } 3821 3822 if (data[IFLA_MACSEC_WINDOW]) { 3823 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3824 3825 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3826 * for XPN cipher suites */ 3827 if (secy->xpn && 3828 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3829 return -EINVAL; 3830 } 3831 3832 return 0; 3833 } 3834 3835 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3836 struct nlattr *data[], 3837 struct netlink_ext_ack *extack) 3838 { 3839 struct macsec_dev *macsec = macsec_priv(dev); 3840 struct macsec_tx_sc tx_sc; 3841 struct macsec_secy secy; 3842 int ret; 3843 3844 if (!data) 3845 return 0; 3846 3847 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3848 data[IFLA_MACSEC_ICV_LEN] || 3849 data[IFLA_MACSEC_SCI] || 3850 data[IFLA_MACSEC_PORT]) 3851 return -EINVAL; 3852 3853 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3854 * propagation fails, to revert macsec_changelink_common. 3855 */ 3856 memcpy(&secy, &macsec->secy, sizeof(secy)); 3857 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3858 3859 ret = macsec_changelink_common(dev, data); 3860 if (ret) 3861 goto cleanup; 3862 3863 /* If h/w offloading is available, propagate to the device */ 3864 if (macsec_is_offloaded(macsec)) { 3865 const struct macsec_ops *ops; 3866 struct macsec_context ctx; 3867 int ret; 3868 3869 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3870 if (!ops) { 3871 ret = -EOPNOTSUPP; 3872 goto cleanup; 3873 } 3874 3875 ctx.secy = &macsec->secy; 3876 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3877 if (ret) 3878 goto cleanup; 3879 } 3880 3881 return 0; 3882 3883 cleanup: 3884 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3885 memcpy(&macsec->secy, &secy, sizeof(secy)); 3886 3887 return ret; 3888 } 3889 3890 static void macsec_del_dev(struct macsec_dev *macsec) 3891 { 3892 int i; 3893 3894 while (macsec->secy.rx_sc) { 3895 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3896 3897 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3898 free_rx_sc(rx_sc); 3899 } 3900 3901 for (i = 0; i < MACSEC_NUM_AN; i++) { 3902 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3903 3904 if (sa) { 3905 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3906 clear_tx_sa(sa); 3907 } 3908 } 3909 } 3910 3911 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3912 { 3913 struct macsec_dev *macsec = macsec_priv(dev); 3914 struct net_device *real_dev = macsec->real_dev; 3915 3916 /* If h/w offloading is available, propagate to the device */ 3917 if (macsec_is_offloaded(macsec)) { 3918 const struct macsec_ops *ops; 3919 struct macsec_context ctx; 3920 3921 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3922 if (ops) { 3923 ctx.secy = &macsec->secy; 3924 macsec_offload(ops->mdo_del_secy, &ctx); 3925 } 3926 } 3927 3928 unregister_netdevice_queue(dev, head); 3929 list_del_rcu(&macsec->secys); 3930 macsec_del_dev(macsec); 3931 netdev_upper_dev_unlink(real_dev, dev); 3932 3933 macsec_generation++; 3934 } 3935 3936 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3937 { 3938 struct macsec_dev *macsec = macsec_priv(dev); 3939 struct net_device *real_dev = macsec->real_dev; 3940 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3941 3942 macsec_common_dellink(dev, head); 3943 3944 if (list_empty(&rxd->secys)) { 3945 netdev_rx_handler_unregister(real_dev); 3946 kfree(rxd); 3947 } 3948 } 3949 3950 static int register_macsec_dev(struct net_device *real_dev, 3951 struct net_device *dev) 3952 { 3953 struct macsec_dev *macsec = macsec_priv(dev); 3954 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3955 3956 if (!rxd) { 3957 int err; 3958 3959 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3960 if (!rxd) 3961 return -ENOMEM; 3962 3963 INIT_LIST_HEAD(&rxd->secys); 3964 3965 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3966 rxd); 3967 if (err < 0) { 3968 kfree(rxd); 3969 return err; 3970 } 3971 } 3972 3973 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3974 return 0; 3975 } 3976 3977 static bool sci_exists(struct net_device *dev, sci_t sci) 3978 { 3979 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3980 struct macsec_dev *macsec; 3981 3982 list_for_each_entry(macsec, &rxd->secys, secys) { 3983 if (macsec->secy.sci == sci) 3984 return true; 3985 } 3986 3987 return false; 3988 } 3989 3990 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3991 { 3992 return make_sci(dev->dev_addr, port); 3993 } 3994 3995 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3996 { 3997 struct macsec_dev *macsec = macsec_priv(dev); 3998 struct macsec_secy *secy = &macsec->secy; 3999 4000 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4001 if (!macsec->stats) 4002 return -ENOMEM; 4003 4004 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4005 if (!secy->tx_sc.stats) { 4006 free_percpu(macsec->stats); 4007 return -ENOMEM; 4008 } 4009 4010 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4011 if (!secy->tx_sc.md_dst) { 4012 free_percpu(secy->tx_sc.stats); 4013 free_percpu(macsec->stats); 4014 return -ENOMEM; 4015 } 4016 4017 if (sci == MACSEC_UNDEF_SCI) 4018 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4019 4020 secy->netdev = dev; 4021 secy->operational = true; 4022 secy->key_len = DEFAULT_SAK_LEN; 4023 secy->icv_len = icv_len; 4024 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4025 secy->protect_frames = true; 4026 secy->replay_protect = false; 4027 secy->xpn = DEFAULT_XPN; 4028 4029 secy->sci = sci; 4030 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4031 secy->tx_sc.active = true; 4032 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4033 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4034 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4035 secy->tx_sc.end_station = false; 4036 secy->tx_sc.scb = false; 4037 4038 return 0; 4039 } 4040 4041 static struct lock_class_key macsec_netdev_addr_lock_key; 4042 4043 static int macsec_newlink(struct net *net, struct net_device *dev, 4044 struct nlattr *tb[], struct nlattr *data[], 4045 struct netlink_ext_ack *extack) 4046 { 4047 struct macsec_dev *macsec = macsec_priv(dev); 4048 rx_handler_func_t *rx_handler; 4049 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4050 struct net_device *real_dev; 4051 int err, mtu; 4052 sci_t sci; 4053 4054 if (!tb[IFLA_LINK]) 4055 return -EINVAL; 4056 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4057 if (!real_dev) 4058 return -ENODEV; 4059 if (real_dev->type != ARPHRD_ETHER) 4060 return -EINVAL; 4061 4062 dev->priv_flags |= IFF_MACSEC; 4063 4064 macsec->real_dev = real_dev; 4065 4066 if (data && data[IFLA_MACSEC_OFFLOAD]) 4067 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4068 else 4069 /* MACsec offloading is off by default */ 4070 macsec->offload = MACSEC_OFFLOAD_OFF; 4071 4072 /* Check if the offloading mode is supported by the underlying layers */ 4073 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4074 !macsec_check_offload(macsec->offload, macsec)) 4075 return -EOPNOTSUPP; 4076 4077 /* send_sci must be set to true when transmit sci explicitly is set */ 4078 if ((data && data[IFLA_MACSEC_SCI]) && 4079 (data && data[IFLA_MACSEC_INC_SCI])) { 4080 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4081 4082 if (!send_sci) 4083 return -EINVAL; 4084 } 4085 4086 if (data && data[IFLA_MACSEC_ICV_LEN]) 4087 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4088 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4089 if (mtu < 0) 4090 dev->mtu = 0; 4091 else 4092 dev->mtu = mtu; 4093 4094 rx_handler = rtnl_dereference(real_dev->rx_handler); 4095 if (rx_handler && rx_handler != macsec_handle_frame) 4096 return -EBUSY; 4097 4098 err = register_netdevice(dev); 4099 if (err < 0) 4100 return err; 4101 4102 netdev_lockdep_set_classes(dev); 4103 lockdep_set_class(&dev->addr_list_lock, 4104 &macsec_netdev_addr_lock_key); 4105 4106 err = netdev_upper_dev_link(real_dev, dev, extack); 4107 if (err < 0) 4108 goto unregister; 4109 4110 /* need to be already registered so that ->init has run and 4111 * the MAC addr is set 4112 */ 4113 if (data && data[IFLA_MACSEC_SCI]) 4114 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4115 else if (data && data[IFLA_MACSEC_PORT]) 4116 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4117 else 4118 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4119 4120 if (rx_handler && sci_exists(real_dev, sci)) { 4121 err = -EBUSY; 4122 goto unlink; 4123 } 4124 4125 err = macsec_add_dev(dev, sci, icv_len); 4126 if (err) 4127 goto unlink; 4128 4129 if (data) { 4130 err = macsec_changelink_common(dev, data); 4131 if (err) 4132 goto del_dev; 4133 } 4134 4135 /* If h/w offloading is available, propagate to the device */ 4136 if (macsec_is_offloaded(macsec)) { 4137 const struct macsec_ops *ops; 4138 struct macsec_context ctx; 4139 4140 ops = macsec_get_ops(macsec, &ctx); 4141 if (ops) { 4142 ctx.secy = &macsec->secy; 4143 err = macsec_offload(ops->mdo_add_secy, &ctx); 4144 if (err) 4145 goto del_dev; 4146 } 4147 } 4148 4149 err = register_macsec_dev(real_dev, dev); 4150 if (err < 0) 4151 goto del_dev; 4152 4153 netif_stacked_transfer_operstate(real_dev, dev); 4154 linkwatch_fire_event(dev); 4155 4156 macsec_generation++; 4157 4158 return 0; 4159 4160 del_dev: 4161 macsec_del_dev(macsec); 4162 unlink: 4163 netdev_upper_dev_unlink(real_dev, dev); 4164 unregister: 4165 unregister_netdevice(dev); 4166 return err; 4167 } 4168 4169 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4170 struct netlink_ext_ack *extack) 4171 { 4172 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4173 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4174 int flag; 4175 bool es, scb, sci; 4176 4177 if (!data) 4178 return 0; 4179 4180 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4181 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4182 4183 if (data[IFLA_MACSEC_ICV_LEN]) { 4184 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4185 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4186 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4187 struct crypto_aead *dummy_tfm; 4188 4189 dummy_tfm = macsec_alloc_tfm(dummy_key, 4190 DEFAULT_SAK_LEN, 4191 icv_len); 4192 if (IS_ERR(dummy_tfm)) 4193 return PTR_ERR(dummy_tfm); 4194 crypto_free_aead(dummy_tfm); 4195 } 4196 } 4197 4198 switch (csid) { 4199 case MACSEC_CIPHER_ID_GCM_AES_128: 4200 case MACSEC_CIPHER_ID_GCM_AES_256: 4201 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4202 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4203 case MACSEC_DEFAULT_CIPHER_ID: 4204 if (icv_len < MACSEC_MIN_ICV_LEN || 4205 icv_len > MACSEC_STD_ICV_LEN) 4206 return -EINVAL; 4207 break; 4208 default: 4209 return -EINVAL; 4210 } 4211 4212 if (data[IFLA_MACSEC_ENCODING_SA]) { 4213 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4214 return -EINVAL; 4215 } 4216 4217 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4218 flag < IFLA_MACSEC_VALIDATION; 4219 flag++) { 4220 if (data[flag]) { 4221 if (nla_get_u8(data[flag]) > 1) 4222 return -EINVAL; 4223 } 4224 } 4225 4226 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4227 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4228 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4229 4230 if ((sci && (scb || es)) || (scb && es)) 4231 return -EINVAL; 4232 4233 if (data[IFLA_MACSEC_VALIDATION] && 4234 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4235 return -EINVAL; 4236 4237 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4238 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4239 !data[IFLA_MACSEC_WINDOW]) 4240 return -EINVAL; 4241 4242 return 0; 4243 } 4244 4245 static struct net *macsec_get_link_net(const struct net_device *dev) 4246 { 4247 return dev_net(macsec_priv(dev)->real_dev); 4248 } 4249 4250 static size_t macsec_get_size(const struct net_device *dev) 4251 { 4252 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4253 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4254 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4255 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4256 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4257 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4258 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4259 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4260 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4261 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4262 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4263 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4264 0; 4265 } 4266 4267 static int macsec_fill_info(struct sk_buff *skb, 4268 const struct net_device *dev) 4269 { 4270 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4271 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4272 u64 csid; 4273 4274 switch (secy->key_len) { 4275 case MACSEC_GCM_AES_128_SAK_LEN: 4276 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4277 break; 4278 case MACSEC_GCM_AES_256_SAK_LEN: 4279 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4280 break; 4281 default: 4282 goto nla_put_failure; 4283 } 4284 4285 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4286 IFLA_MACSEC_PAD) || 4287 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4288 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4289 csid, IFLA_MACSEC_PAD) || 4290 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4291 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4292 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4293 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4294 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4295 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4296 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4297 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4298 0) 4299 goto nla_put_failure; 4300 4301 if (secy->replay_protect) { 4302 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4303 goto nla_put_failure; 4304 } 4305 4306 return 0; 4307 4308 nla_put_failure: 4309 return -EMSGSIZE; 4310 } 4311 4312 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4313 .kind = "macsec", 4314 .priv_size = sizeof(struct macsec_dev), 4315 .maxtype = IFLA_MACSEC_MAX, 4316 .policy = macsec_rtnl_policy, 4317 .setup = macsec_setup, 4318 .validate = macsec_validate_attr, 4319 .newlink = macsec_newlink, 4320 .changelink = macsec_changelink, 4321 .dellink = macsec_dellink, 4322 .get_size = macsec_get_size, 4323 .fill_info = macsec_fill_info, 4324 .get_link_net = macsec_get_link_net, 4325 }; 4326 4327 static bool is_macsec_master(struct net_device *dev) 4328 { 4329 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4330 } 4331 4332 static int macsec_notify(struct notifier_block *this, unsigned long event, 4333 void *ptr) 4334 { 4335 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4336 LIST_HEAD(head); 4337 4338 if (!is_macsec_master(real_dev)) 4339 return NOTIFY_DONE; 4340 4341 switch (event) { 4342 case NETDEV_DOWN: 4343 case NETDEV_UP: 4344 case NETDEV_CHANGE: { 4345 struct macsec_dev *m, *n; 4346 struct macsec_rxh_data *rxd; 4347 4348 rxd = macsec_data_rtnl(real_dev); 4349 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4350 struct net_device *dev = m->secy.netdev; 4351 4352 netif_stacked_transfer_operstate(real_dev, dev); 4353 } 4354 break; 4355 } 4356 case NETDEV_UNREGISTER: { 4357 struct macsec_dev *m, *n; 4358 struct macsec_rxh_data *rxd; 4359 4360 rxd = macsec_data_rtnl(real_dev); 4361 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4362 macsec_common_dellink(m->secy.netdev, &head); 4363 } 4364 4365 netdev_rx_handler_unregister(real_dev); 4366 kfree(rxd); 4367 4368 unregister_netdevice_many(&head); 4369 break; 4370 } 4371 case NETDEV_CHANGEMTU: { 4372 struct macsec_dev *m; 4373 struct macsec_rxh_data *rxd; 4374 4375 rxd = macsec_data_rtnl(real_dev); 4376 list_for_each_entry(m, &rxd->secys, secys) { 4377 struct net_device *dev = m->secy.netdev; 4378 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4379 macsec_extra_len(true)); 4380 4381 if (dev->mtu > mtu) 4382 dev_set_mtu(dev, mtu); 4383 } 4384 } 4385 } 4386 4387 return NOTIFY_OK; 4388 } 4389 4390 static struct notifier_block macsec_notifier = { 4391 .notifier_call = macsec_notify, 4392 }; 4393 4394 static int __init macsec_init(void) 4395 { 4396 int err; 4397 4398 pr_info("MACsec IEEE 802.1AE\n"); 4399 err = register_netdevice_notifier(&macsec_notifier); 4400 if (err) 4401 return err; 4402 4403 err = rtnl_link_register(&macsec_link_ops); 4404 if (err) 4405 goto notifier; 4406 4407 err = genl_register_family(&macsec_fam); 4408 if (err) 4409 goto rtnl; 4410 4411 return 0; 4412 4413 rtnl: 4414 rtnl_link_unregister(&macsec_link_ops); 4415 notifier: 4416 unregister_netdevice_notifier(&macsec_notifier); 4417 return err; 4418 } 4419 4420 static void __exit macsec_exit(void) 4421 { 4422 genl_unregister_family(&macsec_fam); 4423 rtnl_link_unregister(&macsec_link_ops); 4424 unregister_netdevice_notifier(&macsec_notifier); 4425 rcu_barrier(); 4426 } 4427 4428 module_init(macsec_init); 4429 module_exit(macsec_exit); 4430 4431 MODULE_ALIAS_RTNL_LINK("macsec"); 4432 MODULE_ALIAS_GENL_FAMILY("macsec"); 4433 4434 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4435 MODULE_LICENSE("GPL v2"); 4436